Could not find reference "mscorlib".

[ccpu]

Hi,

I am using 'RoslynCodeTaskFactory' for my task as suggested in here:

MSBuild inline tasks with RoslynCodeTaskFactory

Task Code:

<UsingTask TaskName="ExecAsync" TaskFactory="RoslynCodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll">
    <ParameterGroup>
      <Command ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Code Type="Fragment" Language="cs">
        <![CDATA[
            var procStartInfo =
                new System.Diagnostics.ProcessStartInfo("cmd", "/c" + Command)
                {
                    RedirectStandardOutput = false,
                    UseShellExecute = true,
                    CreateNoWindow = false,
                    WindowStyle=System.Diagnostics.ProcessWindowStyle.Minimized
                };

            System.Diagnostics.Process proc = new System.Diagnostics.Process
            {
                StartInfo = procStartInfo
            };
            proc.Start();
       ]]>
      </Code>
    </Task>
  </UsingTask>

it does work fine in the visual studio, however, when running 'dotnet build' it will throw the following errors:

• error MSB3755: Could not find reference "mscorlib". If this reference is required by your code, you may get compilation errors.

• error MSB3755: Could not find reference "netstandard". If this reference is required by your code, you may get compilation errors.

• error MSB4175: The task factory "RoslynCodeTaskFactory" could not be loaded from the assembly "C:\Program Files\dotnet\sdk\2.2.100-preview3-009430\Microsoft.Build.Tasks.Core.dll". The task factory must return a value for the "TaskType" property.

Target: .NET Core v2.1

maybe related problem here: https://github.com/Microsoft/msbuild/issues/3726

Can you please tell what am I missing here.

Thanks

[StevenRasmussen]

@Cyrus-d - Did you find a solution to this? Running into this same error.

[rainersigwald]

Duplicate of https://github.com/Microsoft/msbuild/issues/3726, which has some workarounds.

[jeffkl]

This issue was moved to Microsoft/msbuild#4009

[ccpu]

@SimplerSoftware Unfortunately I couldn't find a proper solution for this, it works fine with visual studio and I am mostly using VS for my works, so it's not bothering me that much. sorry, couldn't be of much help.