After installing the Communitiy Quiz, I got the following message:

Warning: constant(): Couldn't find constant JPATH_ in /mnt/web322/e3/35/59237135/htdocs/joomla_01/libraries/src/Installer/Adapter/ModuleAdapter.php on line 214 Warning: constant(): Couldn't find constant JPATH_ in /mnt/web322/e3/35/59237135/htdocs/joomla_01/libraries/src/Installer/Adapter/ModuleAdapter.php on line 214 {"success":true,"message":null,"messages":{"message":["Die Paket-Installation wurde abgeschlossen!"]},"data":{"redirect":"/administrator/index.php?option=com_installer&view=install"}}