Please take a look at the "How do I post a question effectively?" guidelines.

Posting the error message, without showing the code that generated it, is completely pointless. All anyone can do is guess! My guess is that you wrote code like this: 

$ perl -e 'use Text::CSV; my $csv; $csv->getline'
Can't call method "getline" on an undefined value at -e line 1.

[download]

Possibly a very poor guess, but at least I've replicated your reported error message and shown the code that caused it.

— Ken

In reply to Re^3: Combining Files using Hash by kcott
in thread Combining Files using Hash by chaney123

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