That your snippet runs clean here would tend to indicate that there is nothing wrong with your code; which leaves you in the position of deciding what you should upgrade to fix the problem.

As AS Perl comes with Tk, if upgrading Perl is an option for you, that would probably be the path of least resistance. I've successfully installed the last half dozen AS binary distributions over the top of their predecessors, thus avoiding having to re-build/reinstall all the modules I've added to my distribution, and have yet to find a binary incompatibility. However, I do not run any "production code", or anything vital to me.