Fatal error: Uncaught Error: Class "ilUserInterfaceHookPlugin" not found in /var/www/html/ilias/docs/development/code-examples/ui-exchange/custom-components/ExamplePlugin.php:26 Stack trace: #0 {main} thrown in /var/www/html/ilias/docs/development/code-examples/ui-exchange/custom-components/ExamplePlugin.php on line 26