Sharepoint 2013 workflow + The server was unable to process the request due to an internal error

RequestorId: 321d7a5c-ca52-907e-0000-000000000000. Details: RequestorId: 321d7a5c-ca52-907e-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 401 {"error_description":"The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework SDK documentation and inspect the server trace logs."} {"x-ms-diagnostics":["3001000;reason=\"There has been an error authenticating the request.\";category=\"invalid_client\""],"SPRequestGuid":["321d7a5c-ca52-907e-aab4-69867fb6c2f8"],"request-id":["321d7a5c-ca52-907e-aab4-69867fb6c2f8"],"X-FRAME-
":["SAMEORIGIN"],"SPRequestDuration":["64"],"SPIisLatency":["3"],"Cache-Control":["private"],"WWW-Authenticate":["Bearer realm=\"3eafb22a-93a3-48a8-9c32-16829fce2722\",client_id=\"00000003-0000-0ff1-ce00-000000000000\",trusted_issuers=\"00000005-0000-0000-c000-000000000000@*,00000003-0000-0ff1-ce00-000000000000@3eafb22a-93a3-48a8-9c32-16829fce2722\"","NTLM"],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1; RequireReadOnly"],"MicrosoftSharePointTeamServices":["15.0.0.4481"],"Date":["Mon, 28 Oct 2013 10:49:09 GMT"]} at Microsoft.Activities.Hosting.Runtime.Subroutine.SubroutineChild.Execute(CodeActivityContext context) at System.Activities.CodeActivity.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem
System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation)


I found this error when I attached a designer List workflow and tried to start the workflow

Solution: Your User Profile Sync Service Should be running .If not add the user to the "Manage User " of User Profile server ,this is the user who triggers the workflow


Basic principle behind this is every user triggering the WF should have a profile of him in User Profile Application Service.