Hi Murcia. This may help. In particular, you should reflect on the fact that none of us has a crystal ball which magically shows what your code does and that it's pretty difficult to remotely debug a non-reproducible problem in unknown code.

Other than that, try putting some logging into your CGI so you can determine at which point it fails, then create a minimal test case which reproduces the problem. If that in itself doesn't help you figuring it out, post the test case here and we'll see what we can do.