I expect that the line in question is this one:

for my ($counter=0;$counter<9;$counter++)
[download]

You're making two mistakes there. Firstly you're confusing "for" loops with "foreach" loops. The "for" loop syntax doesn't require a loop variable. And secondly, you have the "my" that is going to declare a loop variable, but you don't actually declare the variable.

You probably meant to write:

for ($counter=0;$counter<9;$counter++)
[download]

But that's probably easier to understand if it's written as:

foreach my $counter (0 .. 8)
[download]

It's worth pointing out that the perldiag man page has complete descriptions of all Perl diagnostic messages.