Thanks Bliako for your suggestions. I corrected the code as you said and it worked. Could you help me to understand the results? I have two similar files. For an input file which worked well, the output is: 

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[download]

While another file which does not work generates this output:

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[download]

Both files have some different titles with the same length after them (1000 digits) What it means? Thank you in advance!

2020-06-01 Athanasius added <code> tags.

In reply to Re^4: Use of uninitialized value in subroutine entry at /home/roarce/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0/Seeder/Finder.pm line 476, <IN> line 8192. by roarce92
in thread Use of uninitialized value in subroutine entry at /home/roarce/perl5/perlbrew/perls/perl-5.28.0/lib/site_perl/5.28.0/Seeder/Finder.pm line 476, <IN> line 8192. by roarce92

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