Quick Basic Compiling Problem

I have a program that I wrote in Quick Basic that I would like to compile. The program runs fine without compiling it. However, when I begin compliling I get the following error message:

0006 64AC Call TESTYORN(Test$) Program memory overflow

43773 Bytes available
688 Bytes Free
0 warnings Error(s)
1 Severe Error(s)

TESTYORN(Test$) is a subprogram within the program. This subprogram occurs at numerous locations throughout.

Is there a method of determining exactly whats going wrong.

Thanks for your help.
Jim