Ruby (Rack) application failed to start - Compression Failed YUI

I’m trying to install teambox through the apache passenger module for ruby and am running into errors starting the server. The error I get is:

Ruby (Rack) application could not be started
Error message:
compression failed (YUI::Compressor::RuntimeError)
Exception class:
Application root:
backtrace to /ruby/1.8/gems/yui-compressor-0.9.1/lib/yui/compressor.rb line 71 in ‘compress’

Any ideas on how I might proceed? Thanks.