I have created a simple email reminder workflow for the owners of the site to know when a document has been added to a doc library.
The workflow is set to start when a new item is created, it starts but within a minute it goes into a suspended status because of the HTTP 500 error.
RequestorId: bacce1df-95db-31a5-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 500 {"Transfer-Encoding":["chunked"],"X-SharePointHealthScore":["0"],"SPClientServiceRequestDuration":["16"],"SPRequestGuid":["bacce1df-95db-31a5-96a7-436751b2009a"],"request-id":["bacce1df-95db-31a5-96a7-436751b2009a"],"X-FRAME-OPTIONS":["SAMEORIGIN"],"MicrosoftSharePointTeamServices":["15.0.0.4649"],"X-Content-Type-Options":["nosniff"],"X-MS-InvokeApp":["1; RequireReadOnly"],"Cache-Control":["max-age=0, private"],"Date":["Tue, 16 Dec 2014 15:44:09 GMT"],"Server":["Microsoft-IIS/8.0"],"X-AspNet-Version":["4.0.30319"],"X-Powered-By":["ASP.NET"]} 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)