Fatal error: Uncaught Error: Class 'Piwik\Plugin' not found in /home/empamtph/cevida/analitic/plugins/ExampleVisualization/ExampleVisualization.php:13 Stack trace: #0 {main} thrown in /home/empamtph/cevida/analitic/plugins/ExampleVisualization/ExampleVisualization.php on line 13