Warning: Undefined array key "status" in /var/www/html/index.php(1) : eval()'d code on line 2

Warning: require(/var/www/html/vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/html/wp-config.php on line 122

Fatal error: Uncaught Error: Failed opening required '/var/www/html/vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /var/www/html/wp-config.php:122 Stack trace: #0 /var/www/html/wp-load.php(50): require_once() #1 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...') #2 /var/www/html/index.php(2): require('/var/www/html/w...') #3 {main} thrown in /var/www/html/wp-config.php on line 122