Replay Error [MsgId: MERR-26612]

While i am trying Replay the Recorded VuGen Script getting below error "Action.c(628): Error -26612: HTTP Status-Code=500 (Internal Server Error) for "https://webapp.test.ftn.fedex.com/gol/pomanage/PurchaseOrderAddSKUAction.jsp?action=add&keyEvnt=true" [MsgId: MERR-26612]"

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