Please check the documentation for further information about error messages. Here, I used the splain program, which comes with Perl:

jpinyan@voyager-dev [12:12pm] ~/web #330> splain 
/usr/local/bin/splain: Reading from STDIN
Encryption.pm did not return a true value at test.pl line 3.
Encryption.pm did not return a true value at test.pl line 3 (#1)
    
    (F) A required (or used) file must return a true value to indicate
+ that
    it compiled correctly and ran its initialization code correctly.  
+It's
    traditional to end such a file with a "1;", though any true value 
+would
    do.  See perlfunc/require.
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