Reports & Discoverer :: Running Report From FORMS 10g?

I have installed Oracle 10g DB and Developer Suite 10g and have made a simple report in it. This report runs perfectly fine when run from Reports Developer even in Browser. But when I called this report from FORM I get error.

The Trigger behind WHEN-BUTTON-PRESSED is

DECLARE
repid REPORT_OBJECT;
v_rep VARCHAR2(100);
rep_status varchar2(20);
v_parameter_string varchar2(4000);

[code]....

I also set my Report Server as rep_fsprod using CMD

rwserver server=rep_fsprod

I have made changes in .env files adding the REPORTS_PATH in it of the location where my reports are placed.Also have made changes in REGISTRY adding in REPORTS_PATH the same location. But when I press button the Browser window opened shows the error REP-51002 - Bind to Reports Server rep_fsprod failed. I need to run reports from FORMS including ones with Parameters.