Program detected issues

Laravel has detected too many issues for this sites php artisan clear-compiled PHP Warning: require(/var/www/html/ibw_new/ibw_new/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /var/www/html/ibw_new/ibw_new/bootstrap/autoload.php on line 17 PHP Fatal error: require(): Failed opening required '/var/www/html/ibw_new/ibw_new/bootstrap/../vendor/autoload.php' (include_path='.:/usr/share/php') in /var/www/html/ibw_new/ibw_new/bootstrap/autoload.php on line 17 Script php artisan clear-compiled handling the pre-update-cmd event returned with error code 255