Warning: require(/var/www/magento/vendor/composer/../guzzlehttp/promises/src/functions_include.php): Failed to open stream: No such file or directory in /var/www/magento/vendor/composer/autoload_real.php on line 73

Fatal error: Uncaught Error: Failed opening required '/var/www/magento/vendor/composer/../guzzlehttp/promises/src/functions_include.php' (include_path='/var/www/magento/vendor/magento/zendframework1/library:.:/usr/share/php') in /var/www/magento/vendor/composer/autoload_real.php:73 Stack trace: #0 /var/www/magento/vendor/composer/autoload_real.php(63): composerRequire677d63d1ea4996d96e5af388063cc2c0('c964ee0ededf28c...', '/var/www/magent...') #1 /var/www/magento/vendor/autoload.php(7): ComposerAutoloaderInit677d63d1ea4996d96e5af388063cc2c0::getLoader() #2 /var/www/magento/app/autoload.php(51): include('/var/www/magent...') #3 /var/www/magento/app/bootstrap.php(43): require_once('/var/www/magent...') #4 /var/www/magento/pub/index.php(12): require('/var/www/magent...') #5 {main} thrown in /var/www/magento/vendor/composer/autoload_real.php on line 73