@lines being empty seems unlikely, since it was grepped out of the file. @fields may not contain four fields though (Edit: whoops, @lines, can be empty, is just can't contain empty strings unless $string1 is empty)
mitchreward, have a look at Data::Dumper. If you use Data::Dumper; and then add print Dumper \@fields; to your loop you may have more information on what is happening.
Edit: the code you provided does compile, so you have removed the error by changing it.
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