Sounds like the module was installed with local::lib, which should normally set its environment variables in .profile/.bashrc. Anyway, did you try the solutions suggested in that link? For example prepending PERL5LIB=/home/pi/perl5/lib/perl5 to the command in your crontab?

In reply to Re^2: Perl app won't compile /run from cron by haukex
in thread Perl app won't compile /run from cron by dazz

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