Fatal error: Cannot use 'String' as class name as it is reserved in /srv/app188.2d384297.configr.cloud/www/source/classes/datatype/String.php on line 3

Fatal error: Uncaught Error: Call to a member function release() on null in /srv/app188.2d384297.configr.cloud/www/source/classes/config/AppConfig.php:136
Stack trace:
#0 [internal function]: onBeforeShutdown()
#1 {main}
  thrown in /srv/app188.2d384297.configr.cloud/www/source/classes/config/AppConfig.php on line 136