Class 'RegisterClass' not found in

[paper]

trying to upgrade to version 2.3.10 from version 2.2

 

we get the following error

Fatal error: Class 'RegisterClass' not found in components/com_jreviews/jreviews/models/everywhere/everywhere_com_save.php on line 120

 

line 120 of everywhere_com_save.php contains:

           $Menu = RegisterClass::getInstance('MenuModel');

 

what is wrong?

[paper]

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