FATAL ERROR / after upgrade prestashop website from 1.7.5.1 to latest version

FATAL ERROR / after upgrade prestashop website from 1.7.5.1 to latest version

Fatal error: Uncaught Error: Class 'Composer\Autoload\ComposerStaticInita467d85d6835c4912cf0774f6ee8b0f8' not found in /var/www/html/mabbcreme/vendor/composer/autoload_real.php:34 Stack trace: #0 /var/www/html/mabbcreme/vendor/autoload.php(7): ComposerAutoloaderInita467d85d6835c4912cf0774f6ee8b0f8::getLoader() #1 /var/www/html/mabbcreme/config/autoload.php(26): require_once('/var/www/html/m...') #2 /var/www/html/mabbcreme/config/config.inc.php(38): require_once('/var/www/html/m...') #3 /var/www/html/mabbcreme/admin12rv47Ss/index.php(42): require('/var/www/html/m...') #4 {main} thrown in /var/www/html/mabbcreme/vendor/composer/autoload_real.php on line 34