Error on php7.2 yii migrate

i’am claiming this error on php7.2 yii migrate, how i can resolve this ?

PHP Warning: require(/var/www/xxxxx/ failed to open stream: No such file or directory in /var/www/xxxx/ on line 6
PHP Fatal error: require(): Failed opening required ‘/var/www/xxxxx/’ (include_path=’.:/usr/share/php’) in /var/www/xxxxx/ on line 6

You must do that command after the installation process.