Problem with Perlscript rerun

[Marty]

I have created a perlscript that uses the Tk package.
It runs just fine the first time but the 2nd time I run it, it get's
an error.
Error in ? (PerlScript) script code at Line 1, Column 0 (Internal Error)

If I close VBP and open it again, I can run the script again, one time only before I get the error again. I do not have this problem with scripts that don't have the use Tk; line. Any ideas?

Any other ways to create more sophisticated windows than msgbox in win32?

Marty