Thank you so much! This led me right to the problem, if rather verbosely.

It turns out that whilst streamlining my code, I made incorrect use of a hash slice that brought in more values--some of which were undef--than I had intended; these had no effect on the display but generated errors.

In reply to Re: Re: Tracking down "uninitialized value" errs by jest
in thread Tracking down "uninitialized value" errs by jest

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