Fatal error: PHP Fatal error: Class 'T3Path' not found in /../plugins/system/t3/t3.php on line XXX
The most common cause of this PHP fatal error is the wrong order of the T3 Framework system plugin. It should be loaded before Responsive Scroll Triggered Box - Render Plugin.
How to Fix it
Go to Joomla Plugins Manager and find the Responsive Scroll Triggered Box - Render plugin. Then try to re-order it after T3 Framework.