System.MissingMethodException: Method 'System.Net.ServicePointManager.CloseConnectionGroups' not found.

[Dmdv]

Prerequisites:

dotnet --info

.NET Core SDK (reflecting any global.json): Version: 2.1.403 Commit: 04e15494b6

Runtime Environment: OS Name: debian OS Version: 9 OS Platform: Linux RID: debian.9-x64 Base Path: /usr/share/dotnet/sdk/2.1.403/

Host (useful for support): Version: 2.1.5 Commit: 290303f510

.NET Core SDKs installed: 2.1.403 [/usr/share/dotnet/sdk]

.NET Core runtimes installed: Microsoft.AspNetCore.All 2.1.5 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All] Microsoft.AspNetCore.App 2.1.5 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 2.1.5 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

Copied information from Mono info:

=== MonoDevelop ===

Version 7.3.3 (build 5) Installation UUID: 222bf352-11b6-48c3-ada3-deee1a8dbf1d Runtime: Mono 5.4.1 ((HEAD/e66d9ab Fri Jan 12 18:41:48 UTC 2018) (64-bit) GTK+ 2.24.29 (Adwaita theme)

=== NuGet ===

Version: 4.3.1.4445

=== .NET Core ===

Runtime: Not installed SDK: Not installed MSBuild SDKs: /app/lib/mono/msbuild/15.0/bin/Sdks

=== Build Information ===

Release ID: 703030005 Git revision: b1c2982e201e71ef758866c9ade05f253a8c6f47 Build date: 2018-01-12 19:18:51+00

=== Operating System ===

Linux Linux 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u5 (2017-09-19) x86_64

Exception:

Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.MissingMethodException: Method 'System.Net.ServicePointManager.CloseConnectionGroups' not found. at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpClient.Dispose (System.Boolean disposing) [0x0002c] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d43.MoveNext () [0x00140] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d42.MoveNext () [0x0006a] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at Microsoft.AspNetCore.SignalR.Client.HttpConnectionFactory+d3.MoveNext () [0x00121] in <9c8319c00fd84c54a76335556c8ac52d>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d31.MoveNext () [0x00130] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d24.MoveNext () [0x00076] in :0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) [0x00011] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:2157 at System.Threading.Tasks.Task.Wait (System.Int32 millisecondsTimeout, System.Threading.CancellationToken cancellationToken) [0x00043] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3189 at System.Threading.Tasks.Task.Wait () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3054 at ConsoleClient.Program.Main () [0x0004b] in /home/dmitry/Development/api-gatecoin-dotnet/ConsoleClient/Program.cs:27 ---> (Inner Exception #0) System.MissingMethodException: Method 'System.Net.ServicePointManager.CloseConnectionGroups' not found. at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpClient.Dispose (System.Boolean disposing) [0x0002c] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d43.MoveNext () [0x00140] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d42.MoveNext () [0x0006a] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at Microsoft.AspNetCore.SignalR.Client.HttpConnectionFactory+d3.MoveNext () [0x00121] in <9c8319c00fd84c54a76335556c8ac52d>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d31.MoveNext () [0x00130] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d24.MoveNext () [0x00076] in :0 <---

[ERROR] FATAL UNHANDLED EXCEPTION: System.AggregateException: One or more errors occurred. ---> System.MissingMethodException: Method 'System.Net.ServicePointManager.CloseConnectionGroups' not found. at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpClient.Dispose (System.Boolean disposing) [0x0002c] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d43.MoveNext () [0x00140] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d42.MoveNext () [0x0006a] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at Microsoft.AspNetCore.SignalR.Client.HttpConnectionFactory+d3.MoveNext () [0x00121] in <9c8319c00fd84c54a76335556c8ac52d>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d31.MoveNext () [0x00130] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d24.MoveNext () [0x00076] in :0 --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) [0x00011] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:2157 at System.Threading.Tasks.Task.Wait (System.Int32 millisecondsTimeout, System.Threading.CancellationToken cancellationToken) [0x00043] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3189 at System.Threading.Tasks.Task.Wait () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3054 at ConsoleClient.Program.Main () [0x0004b] in /home/dmitry/Development/api-gatecoin-dotnet/ConsoleClient/Program.cs:27 ---> (Inner Exception #0) System.MissingMethodException: Method 'System.Net.ServicePointManager.CloseConnectionGroups' not found. at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.DelegatingHandler.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageHandler.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose (System.Boolean disposing) [0x0001e] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpClient.Dispose (System.Boolean disposing) [0x0002c] in <8e2f55f3d010417ba74221386eddd388>:0 at System.Net.Http.HttpMessageInvoker.Dispose () [0x00000] in <8e2f55f3d010417ba74221386eddd388>:0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d43.MoveNext () [0x00140] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.Http.Connections.Client.HttpConnection+d42.MoveNext () [0x0006a] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at Microsoft.AspNetCore.SignalR.Client.HttpConnectionFactory+d3.MoveNext () [0x00121] in <9c8319c00fd84c54a76335556c8ac52d>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d31.MoveNext () [0x00130] in :0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in /run/build/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:113 at System.Threading.Tasks.ForceAsyncAwaiter.GetResult () [0x0000c] in :0 at Microsoft.AspNetCore.SignalR.Client.HubConnection+d24.MoveNext () [0x00076] in :0 <---

[mrward]

It looks like a problem with the .NET Core sdk installation.

1. Does this fail from the command line? Or only when running from MonoDevelop?
2. How are you running the ASP.NET Core project?
3. Can you provide a sample project that reproduces this?