Error when executing function in MSS launchpad report ???

In MSS lanchpad report, we have the following problem:

Error in Manager Sef-Service
When calling the report, the following error occurred:
System: HRP
Error when executing function

Basically in MSS report, I select employees in the first iView which calls another ABAP query in back-end to display back-end t-code inside iView of portal through ITS service. What could be the reason for it? please advice.

Thanks,

Anthony