Trying to export csharp client

[robsoh09]

This error appears:

System.InvalidOperationException: The properties 'feeOptions' are defined multiple times.

Runtime: Default at NJsonSchema.JsonSchema.get_ActualProperties() at NJsonSchema.CodeGeneration.CSharp.Models.ClassTemplateModel..ctor(String typeName, CSharpGeneratorSettings settings, CSharpTypeResolver resolver, JsonSchema schema, Object rootObject) at NJsonSchema.CodeGeneration.CSharp.CSharpGenerator.GenerateClass(JsonSchema schema, String typeName) at NJsonSchema.CodeGeneration.GeneratorBase.GenerateTypes() at NJsonSchema.CodeGeneration.CSharp.CSharpGenerator.GenerateTypes() at NSwag.CodeGeneration.ClientGeneratorBase`3.GenerateFile(ClientGeneratorOutputType outputType) at NSwag.Commands.CodeGeneration.OpenApiToCSharpClientCommand.d107.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.CodeGeneration.OpenApiToCSharpClientCommand.d106.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.NSwagDocument.<>c__DisplayClass8_1.<b0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.NSwagDocument.d8.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.Document.ExecuteDocumentCommand.d9.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.Document.ExecuteDocumentCommand.d8.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NConsole.CommandLineProcessor.d12.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at NConsole.CommandLineProcessor.d11.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at NSwag.Commands.NSwagCommandProcessor.d__3.MoveNext()

how can i troubleshoot this?