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WinWF Internal Error, terminating workflow .... System.ArgumentException: listItemKey

we are getting the below error on a straight forward flexi task workflow.03/09/2017 13:05:19.12               w3wp.exe (0x1C34)                                      0x1E78  SharePoint Foundation                       Workflow Infrastructure               88xr       Unexpected        WinWF Internal Error, terminating workflow Id# 7dff798e-d389-4553-a7e8-2ad6bccff478              03/09/2017 13:05:19.12               w3wp.exe (0x1C34)                                      0x1E78  SharePoint Foundation                       Workflow Infrastructure               98d4      Unexpected               System.ArgumentException: listItemKey     at Microsoft.SharePoint.WorkflowActions.WaitForDocumentUnlockActivity.Initialize(WorkflowContext context, Guid listID, SPItemKey listItemKey)     at Microsoft.SharePoint.WorkflowActions.WithKey.UpdateItemActivity.Execute(ActivityExecutionContext provider)     at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(T activity, ActivityExecutionContext ex