while i have not tried it myself, i think its rather safe to say this is not the trouble. if it were, no doubt there would be quite a few other errors, and "Tk.pm" as reported in the error would have never been used. about the actual question however. personally, i just use -w when writing the code, once i start using it full time i usually remove the -w, unless i plan to fix bugs later on. asides, one error isnt bad :)