WPG3 Error

It kills the entire admin area of my site with the following error. I can’t even deactivate it. I have to manually delete it through ftp.

Warning: include(wpg3_class_WPG3_Xhttp.php) [function.include]: failed to open stream: No such file or directory in /hermes/web06b/b1697/moo.grunzs/blog/wp-content/plugins/wpg3/wpg3.php on line 640

Warning: include(wpg3_class_WPG3_Xhttp.php) [function.include]: failed to open stream: No such file or directory in /hermes/web06b/b1697/moo.grunzs/blog/wp-content/plugins/wpg3/wpg3.php on line 640

Warning: include() [function.include]: Failed opening ‘wpg3_class_WPG3_Xhttp.php’ for inclusion (include_path=’.:/usr/local/lib/php-5.2.12/lib/php’) in /hermes/web06b/b1697/moo.grunzs/blog/wp-content/plugins/wpg3/wpg3.php on line 640

Fatal error: Class ‘WPG3_Xhttp’ not found in /hermes/web06b/b1697/moo.grunzs/blog/wp-content/plugins/wpg3/wpg3.php on line 427