Warning: require_once(plugin.php): Failed to open stream: No such file or directory in /var/www/clients/client2/web23/web/wp-content/plugins/image-optimization/image-optimization.php on line 222

Fatal error: Uncaught Error: Failed opening required 'plugin.php' (include_path='.:/usr/share/php') in /var/www/clients/client2/web23/web/wp-content/plugins/image-optimization/image-optimization.php:222 Stack trace: #0 /var/www/clients/client2/web23/web/wp-includes/class-wp-hook.php(353): ImageOptimization->init() #1 /var/www/clients/client2/web23/web/wp-includes/class-wp-hook.php(377): WP_Hook->apply_filters() #2 /var/www/clients/client2/web23/web/wp-includes/plugin.php(523): WP_Hook->do_action() #3 /var/www/clients/client2/web23/web/wp-settings.php(630): do_action() #4 /var/www/clients/client2/web23/web/wp-config.php(98): require_once('...') #5 /var/www/clients/client2/web23/web/wp-load.php(50): require_once('...') #6 /var/www/clients/client2/web23/web/wp-blog-header.php(13): require_once('...') #7 /var/www/clients/client2/web23/web/index.php(17): require('...') #8 {main} thrown in /var/www/clients/client2/web23/web/wp-content/plugins/image-optimization/image-optimization.php on line 222