Error on human task invoking a web service.

Summary:

We are creating offers some of it went to the Approval process ok some of it went in error

Error encountered when HWF invokes a web service.

Operation getOfferManagerRolesByUsername on service RecruitingCommonTransactionService failed with error: JBO-27035: Attribute User Name is required.

Look at the diagnostic log for the detailed error message.If the fault is an access denied message, ensure that the user executing the web service in question has the appropriate privilege in place prior to executing the web service in the approval flow. If the error message indicates failure due to a business logic issue, verify the business data passed to the approval flow satisfies the business validation logic.