Fatal error: Uncaught Error: Class 'yii\base\Event' not found in /home/ffl2020/public_html/vendor/yiisoft/yii2-httpclient/src/RequestEvent.php:18 Stack trace: #0 {main} thrown in /home/ffl2020/public_html/vendor/yiisoft/yii2-httpclient/src/RequestEvent.php on line 18