Oracle Forms

I get the message above when I try to compile a Forms procedure with a call to specific functions in the DBMS_UTILITY package. I am using Forms 10.1.2.2.0 and 10g DB (10.2.0.4.0). I want to trace the PL/SQL path that my Forms application is taking and be able to report the line number of the failure when an exception is thrown. I am able to call some routines within the DBMS_UTILITY package, but not any of them that have "pragma interface (C, format_error_stack);" in the code. These include format_call_stack, format_error_stack, and format_error_backtrace; all of which I would like to use. I've tried creating my own DB package function to act as a wrapper; this allows me to compile the form, but the call to the function form my exception handler returns null. These are really useful functions, but I do need to be able to access the functionality from within Forms. Does anyone have a solution/workaround for this problem. Note, this is similar to the question in Link:[ http://forums.oracle.com/forums/thread.jspa?messageID=504922��]
Thanks JK.