Fatal error: Uncaught Error: Class 'yii\base\Widget' not found in /home/mpolsk5/public_html/visibilityfuel.com/vendor/yiisoft/yii2-debug/src/widgets/NavigationButton.php:18 Stack trace: #0 {main} thrown in /home/mpolsk5/public_html/visibilityfuel.com/vendor/yiisoft/yii2-debug/src/widgets/NavigationButton.php on line 18