Plugin Causing my Site to Crash

My ww.wp.xz.cn site crashes with the following error whenever I try to access it:

Fatal error: Internal Zend error – Missing class information for in /home/content/64/9448764/html/wp-content/plugins/like-button-plugin-for-wordpress/include/gb_generate.php on line 22

Anybody got any ideas as to what is going on? I can see it’s being caused by a plug-in, but I’m not sure which one.

Any help is greatly appreciated.