Fatal error: Uncaught Error: Class "Piwik\Plugin\Controller" not found in /usr/home/mw2p5ujyzt/www/htdocs/mode2_piwik/plugins/VisitFrequency/Controller.php:19 Stack trace: #0 {main} thrown in /usr/home/mw2p5ujyzt/www/htdocs/mode2_piwik/plugins/VisitFrequency/Controller.php on line 19