I'm looking for a dictionary or encyclopedia of sorts for Perl error and warning messages. I searched for the following, didn't find much of use.

In short, perldiag, but in your programs, also:

use diagnostics;

The diagnostics pragma will expound upon any warning or error from Perl itself, with the text from perldiag.

I was just wondering what the extra verbage with in method with known name contributes?

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Update

Now that I'm back at my Perl build machine, I took a look at the opcode you mentioned. I think the AnonyMonk before me linked the most relevant source. As I understand it, the method_named is just a scratch placeholder for an identifier that Perl didn't bother to track (someone please correct me if I'm wrong), so the important part of this message is still the "uninitialized value", and you have a filename and line number, so you should be fine just acting on that as normal. If you think there's more to it, go ahead and post the method code and anything else that's relevant, and mark the error line for us somehow.