execute jasper report from jsp page

Hi,

to execute jasper report from input jsp page I am using the following API-

 ReportHelper.manager.getThirdPartyReportExecuteUrl(reportRef,parameters);

Here, the reportRef should be of type ObjectReference and should refer to a Windchill report object. However the object that I get from the jsp page using the request.getParameter("oid") is of type WTDocument. 

Now, when I try to send this object in the above API , it gives the error-

java.lang.ClassCastException: class wt.doc.WTDocument cannot be cast to class com.ptc.windchill.enterprise.report.Report (wt.doc.WTDocument and com.ptc.windchill.enterprise.report.Report are in unnamed module of loader 'app')

Kindly suggest on how to resolve this.

Thanks,

Ramsha