import is failing in Python or your
require can't locate a
Ruby file, here is how to find the load path in each language:
$ python >>> import sys >>> sys.path ['', '/usr/lib/python2.5', '/usr/lib/python2. ...]
$ irb >> $LOAD_PATH => ["/usr/local/lib/site_ruby/1.8", "/usr/local ...]
These should help you debug load errors, especially if you're new to either language.