main and external script

spadacciniweb has asked for the wisdom of the Perl Monks concerning the following question:

I have a main program named "mal.pl" as:

1   #!/usr/bin/perl -w
2 
3   push @INC, ".";
4   require "config.conf";
5..7
8   print $verbose;
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and in the same directory, the file "config.conf" as

1   $verbose = 1;
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Question: if run "mal.pl"... why the output is:

  Name "main::verbose" used only once: possible typo at ./mal.pl line 
+8.
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thank you