Fatal error: Uncaught Error: Class 'think\App' not found in D:\vhostroot\LocalUser\koada\www\thinkphp\start.php:19 Stack trace: #0 D:\vhostroot\LocalUser\koada\www\index.php(23): require() #1 {main} thrown in D:\vhostroot\LocalUser\koada\www\thinkphp\start.php on line 19