Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractString" not found in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/string/ByteString.php:26 Stack trace: #0 {main} thrown in /home2/yiikharazmisabt/public_html/yii2-app/vendor/symfony/string/ByteString.php on line 26