Hi Gurbir,
well If yuo have run catproc then the proc set_sql_trace_in_session should have been present in dbms_system package.
Other than you first misleading query and criticism, you have still not posted any further information/investigation. Is the package dbms_system accesible ? what is the exact error you are getting when you run the proc.Are the procedures valid in the package?
And yes, I accept. It was a mistake in getting into argument with you as the present thread shows.
As it happens, you didn't even catch the pun of my signature.

Best wishes for the new year