Object plugin help

I've been making a plugin which can interact with the database, currently the names just follow those given in the creating objects tutorial. I followed the tutorial, not chaning much but when I look at the plugin list it is greyed out and in the activity log I get this message:

Plugin error: /var/www/cgi-bin/mt/plugins/Foo/Foo.pl Can't locate MT/Foo.pm in @INC (@INC contains: /var/www/cgi-bin/mt/plugins/Foo/lib /var/www/cgi-bin/mt/plugins/zemanta/lib /var/www/cgi-bin/mt/plugins/spamlookup/lib /var/www/cgi-bin/mt/plugins/StyleCatcher/lib /var/www/cgi-bin/mt/plugins/mixiComment/lib /var/www/cgi-bin/mt/plugins/WidgetManager/lib /var/www/cgi-bin/mt/plugins/EventEmailer/lib /var/www/cgi-bin/mt/plugins/FacebookCommenters/extlib /var/www/cgi-bin/mt/plugins/FacebookCommenters/lib /var/www/cgi-bin/mt/plugins/Textile/lib /var/www/cgi-bin/mt/plugins/WXRImporter/lib /var/www/cgi-bin/mt/addons/Commercial.pack/lib /var/www/cgi-bin/mt/addons/Community.pack/lib /var/www/cgi-bin/mt/extlib /var/www/cgi-bin/mt/extlib lib /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at /var/www/cgi-bin/mt/plugins/Foo/Foo.pl line 18.
BEGIN failed--compilation aborted at /var/www/cgi-bin/mt/plugins/Foo/Foo.pl line 18.
Compilation failed in require at lib/MT.pm line 1360.

I tried putting Foo.pm in /var/www/cgi-bin/mt/plugins/Foo/lib and /var/www/cgi-bin/mt/plugins/Foo/lib/Foo and get the same message each time.

What can I do to fix this?