docusign-esign-csharp-client: Could not load type 'System.IdentityModel.Tokens.JwtSecurityTokenHandler' from assembly 'System.IdentityModel.Tokens.Jwt

Using docusign version 3.1.1-rc.

When calling RequestJWTUserToken in a WebApi project the following error occurs:

“ClassName”: “System.TypeLoadException”, “Message”: “Could not load type ‘System.IdentityModel.Tokens.JwtSecurityTokenHandler’ from assembly ‘System.IdentityModel.Tokens.Jwt, Version=5.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’.”, “Data”: null, “InnerException”: null, “HelpURL”: null, “StackTraceString”: " at DocuSign.eSign.Client.ApiClient.RequestJWTUserToken(String clientId, String userId, String oauthBasePath, Byte[] privateKeyBytes, Int32 expiresInHours, List1 scopes)\r\n at Homer.Service.Helpers.Docusign.JWTAuthLogin() in C:\\Code\\homer.service\\Homer.Service\\Helpers\\Docusign.cs:line 56\r\n at Homer.Service.Controllers.DocumentsController.Test() in C:\\Code\\homer.service\\Homer.Service\\Controllers\\DocumentsController.cs:line 22\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_1.<GetExecutor>b__3(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary2 arguments, CancellationToken cancellationToken)\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()\r\n— End of stack trace from previous location where exception was thrown —\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()", “RemoteStackTraceString”: null, “RemoteStackIndex”: 0, “ExceptionMethod”: “8\nRequestJWTUserToken\nDocuSign.eSign, Version=3.1.1.0, Culture=neutral, PublicKeyToken=7fca6fcbbc219ede\nDocuSign.eSign.Client.ApiClient\nOAuthToken RequestJWTUserToken(System.String, System.String, System.String, Byte[], Int32, System.Collections.Generic.List`1[System.String])”, “HResult”: -2146233054, “Source”: “DocuSign.eSign”, “WatsonBuckets”: null, “TypeLoadClassName”: “System.IdentityModel.Tokens.JwtSecurityTokenHandler”, “TypeLoadAssemblyName”: “System.IdentityModel.Tokens.Jwt, Version=5.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35”, “TypeLoadMessageArg”: null, “TypeLoadResourceID”: -2146233054

Am I missing something?

Thanks