Fatal error: Uncaught Error: Interface "Dhii\Modular\Module\ModuleInterface" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/src/PluginModule.php:19 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/src/PluginModule.php on line 19