error Require of RT::Action:: failed. Can't locate RT/Action/.pm in @INC

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http://serverfault.com – We got up this morning with an error on our apache2 server which prevented it from starting. The apache log showed: [error] Require of RT::Action:: failed.\nCan't locate RT/Action/.pm in @INC (@INC contains: /usr/local/share/request-tracker3.8/lib /usr/local/share/request-tracker3.8/plugins/RTx-Calendar/lib /usr/share/request-tracker3.8/lib /etc/perl /usr/local/lib/perl/5.10.1 /usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl . /etc/apache2) at (eval 1307) line 3.\n\nCompilation failed in require at ( (HowTos)