Activate : Fatal Error

I’ve uploaded the plugin to my word press account, but it won’t activate. It comes up with this error message.

Fatal error: Cannot redeclare class UniteProviderDBUG in /home/content/01/8482801/html/wp-content/plugins/unitegallery/inc_php/framework/provider/provider_db.class.php on line 5

https://ww.wp.xz.cn/plugins/unite-gallery-lite/