How can i get the error report

Saying

use strict;
use warnings;
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is always a good idea. What happens if PDF->new($aa) fails and doesn't return an object? The IsaPDF method might not be applicable on $pdf in that case.

Maybe the directory contains only one pdf file? You could check the contents of your @all array with

print "\@all = (",join(',',map { "'$_'" } @all),")\n";
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before entering the loop.

Did your script produce any output? If so, post it. And why did you undef $/ ?

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}