Notice the error message.  Read the error message.  Believe the error message.

Undefined subroutine &main:pen_log called at ./logtest2.module.pl line 23.

In particular, I noticed you are using a function by the name of open_log().  In the error message, Perl is complaining about not finding a function by the name of pen_log().  Do you see the problem now?

Also, read what runrig wrote as well as the perldoc on Perl Modules.

In reply to Re: try to understand use lib in module by northwind
in thread try to understand use lib in module by convenientstore

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