Interlink Definition: Execution failed.

PeopleSoft Integration fails

Hi Guys,
We are integrating with active directory from peoplesoft. few of the messages are failing with the below error message, but most of the messages are success.
I have checked in active directory for the employee to whom the message is processing. but the all the employees are available. not sure how to resolve this.

Interlink Definition: Execution failed. (122,2) FUNCLIB_EO_DS.DSMASSCHANGE.FieldFormula Name:GetAtt PCPC:4539 Statement:60
Called from:FUNCLIB_EO_DS.DSPCODE.FieldFormula Name:PopAttrMap Statement:828