Change WordPress user roles and capabilities › Forums › Bug Reports › Can't activate due to Fatal Error › Reply To: Can't activate due to Fatal Error
12/05/2017 at 14:36 #3698
Check that all URE Pro files are copied to the live environment. It seems that some files are missed or have wrong permissions.
Error message is about class defined at this file: user-role-editor-pro/includes/plugin-update-checker.php
Compare PHP version also. Your live environment can have an older PHP version.