in reply to Perl module problem

  1. use strict may reveal a nunmber of errors.
  2. use Data::Dumper; and print Dumper $oBook; just before the for loop, will show what $oBook contains.
  3. Manually debug with Perl -d. You can determine what is there, what can be done, and why.

--
TTTATCGGTCGTTATATAGATGTTTGCA

In Section Seekers of Perl Wisdom