Fatal error: Uncaught Error: Class 'think\Model' not found in /www/wwwroot/0.vhai.com/1.vhai.com/feijin_shop/source/thinkphp/library/think/model/Merge.php:18 Stack trace: #0 {main} thrown in /www/wwwroot/0.vhai.com/1.vhai.com/feijin_shop/source/thinkphp/library/think/model/Merge.php on line 18