Notice: require(): Read of 235 bytes failed with errno=12 Cannot allocate memory in /var/www/html/vendor/composer/autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/composer/../magento/module-backend/cli_commands.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/vendor/composer/autoload_real.php:41 Stack trace: #0 /var/www/html/vendor/composer/autoload_real.php(45): {closure}() #1 /var/www/html/vendor/autoload.php(25): ComposerAutoloaderInit31e137add59e34cc8958c98f406e953f::getLoader() #2 /var/www/html/app/autoload.php(51): include('...') #3 /var/www/html/app/bootstrap.php(44): require_once('...') #4 /var/www/html/pub/index.php(18): require('...') #5 {main} thrown in /var/www/html/vendor/composer/autoload_real.php on line 41