[support] PJIRC module not working

Hi I'm trying to setup the PJIRC chat module in my Drupal 4.7 install, but no matter how I install it, the applet is not loading and I'm getting this error in the log: modules/pjirc/pjirc/irc/ParameterProvider.class not found. I have checked and the module files downloaded from drupal.org do not include the above file. Am I missing something here? Thanks in advance for any assistance -- Albert