What version of Perl are you using (and what was your previous version)? 
perl -v

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I looked at Device::Leap on CPAN, and there are many passing tests on recent Perl versions. However, there is only one test in the test suite, and it does nothing more than check that the module can be loaded. So, those runtime warnings you get would never be detected by CPAN Testers.

It is likely you are affected by incompatible changes in a new version of Perl. Check the perldeltas at http://perldoc.perl.org/index-history.html

In reply to Re: Strange errors in CPAN modules when running on Windows 8.1 by toolic
in thread Strange errors in CPAN modules when running on Windows 8.1 by schweini

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