Fatal error: Uncaught Error: Class 'think\App' not found in /var/www/html/food2china/thinkphp/start.php:21 Stack trace: #0 /var/www/html/food2china/public/index.php(23): require() #1 {main} thrown in /var/www/html/food2china/thinkphp/start.php on line 21