Laravel access error message: 'Warning: require (/vendor/autoload. php): failedtoopenstream: Nosuchfileordire

Laravel access error message: 'Warning: require (vendorautoload. php): failedtoopenstream: Nosuchfileordire error message: 'Warning: require (/http/login): failed to open stream: No such file or directory in/http/www.mywakavLee.cn/bootstrap/autoload.php on line 17

Fatal error: require (): Failed opening required'/http/ingress (include_path = '.:/usr/local/lib/php') in/http/www.mywakavLee.cn/bootstrap/autoload.php on line 17'

Cause: The vendor Directory is missing in the root directory of the website, which stores laraver dependent packages.
Solution: Use composer install for installation (if not installed, use composer update before)

Because I have not installed the composer update command, an error is reported,

Then you can access the website.