Adobe forms Error in Load Runner.

Hi Experts,
We are dealing with Adobe forms in the enterprise portal.

We have a leave application in the portal and the leave application is an ADOBE FORM. we are able to download in the same portal page,fill the form and as well as submit it during recording.

But while replaying it throws this message -->"Warning -26612: HTTP Status-Code=500 (Internal Server Error))<--

While replaying the Adobe form is not downloaded and actual funtionality of the leave application is not acheived.

Thanking in Advance.