Error: An error occurred while calling service.Possibly caused by authentication failure Shelby Murrell February 19, 2019 18:33 Updated Follow Description Error on running a webservice:An error occurred while calling service. Exception has been thrown by the target of invocation. Possibly caused by authentication failure. Applies to Workflow 10.x Cause Winshuttle Worker service may have stopped. Solution Restart Worker service Additional Information Error: No worker is available to handle the request Related articles Error: Exception Has Been Thrown by the Target of an Invocation Winshuttle.Studio.Office.Addin has fired an exception Error: No worker is available to handle the request Error from processor: Corrupt OpenXML document. ErrorCode: 2028 - Office 365 An error occurred while calling service. Exception has been thrown by the target of an invocation. Error message received from Worker: Error from processor: Error while checking policies for the current user. Comments 0 comments Please sign in to leave a comment.