$__ROOT__
seem’s to be your document root (writed as a “magic constant” variable..
and visibly, the transition to php7 broke… 🙂
often it’s defined by using real php magic constant like :
For PHP >= 5.3.0 try
__DIR__
For PHP < 5.3.0 try
dirname(__FILE__)
solved Undefined variable: __ROOT__ PHP 7? [duplicate]