I have installed and configured sSharePoint 2013 workflow manager according to the instructions on msdn. When i create a simple workflow in SharePOint designer, just one task, the task gets canceled and this error message appears:

RequestorId: 07d0dc78-24ac-7c71-78a3-fcefb293ccf8. Details: System.ArgumentException: ContentTypeId 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.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation) 

Does anybody know what the problem is?

Thanks
//Joakim