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 GUI scripting and running on Server Error: Exception has been thrown by the target of an invocation Error: No worker is available to handle the request Server was unable to process the request-Get Plugin- timeout expired Comments 0 comments Please sign in to leave a comment.