WEBUTIL error on WHEN BUTTON PRESSED TRIGGER

I am developing a form on oracle forms 10g 10.2.0.2.

I have a requirement for a "BROWSE" button which needed WEBUTIL to be configured. I have done all that and even got the test form running.

My custom form too compiles successfully on unix server. But when i run the form i get the following error:

ORA-01403: no data found.

When i view the details i get this:

FRM-40735: WHEN-BUTTON-PRESSED trigger raised unhandled exception ORA-06508 (could not find program unit being called).

Please help...