I've got a workflow that assigns an approval task to a manager. After approval the workflow creates a SharePoint site. Out of about 100 successful workflows 2 have erred out with this error message "Error in task. Unauthorized attempt to update workflow task by i:0#.w|. The response has not been recorded". In the workflow history, it shows that the manager approved the task and then the very next line show the error message above. Does anyone know why this is happening?