This is due to a recent regression in Module::Pluggable v3.01. It's mistakenly trying to load a directory as if it were a .pm file. Workarounds:
1) Upgrade to Perl::Critic 0.17, which is now on CPAN.
2) Downgrade to Module::Pluggable 3.0 or 2.97
I've relayed the bug to the Module::Pluggable author.
-- Chris Dolan