It means that some your variables, for example $in[3], don't contain any values.

It also means that some variables don't contain the values that you think they should - so check their values with print statements, the debugger, Data::Dumper or Smart::Comments.

And these are not errors (fatal), but warnings (nonfatal).

In reply to Re: Uninitialized value in concatenation by moritz
in thread Uninitialized value in concatenation by eiglesias

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