Fatal error: Uncaught Error: Call to undefined function app() in /data/wwwroot/all_database.php:51 Stack trace: #0 /data/wwwroot/mdd.yunhucheng.cn/app/common.php(20): include() #1 /data/wwwroot/mdd.yunhucheng.cn/vendor/topthink/framework/src/think/App.php(509): include_once('/data/wwwroot/m...') #2 /data/wwwroot/mdd.yunhucheng.cn/vendor/topthink/framework/src/think/App.php(449): think\App->load() #3 /data/wwwroot/mdd.yunhucheng.cn/vendor/topthink/framework/src/think/Http.php(186): think\App->initialize() #4 /data/wwwroot/mdd.yunhucheng.cn/vendor/topthink/framework/src/think/Http.php(163): think\Http->initialize() #5 /data/wwwroot/mdd.yunhucheng.cn/vendor/zoujingli/think-library/src/service/RuntimeService.php(234): think\Http->run() #6 /data/wwwroot/mdd.yunhucheng.cn/vendor/zoujingli/think-library/src/service/SystemService.php(465): think\admin\service\RuntimeService::doWebsiteInit() #7 /data/wwwroot/mdd.yunhucheng.cn/vendor/zoujingli/think-library/src/service/SystemService.php(434): think\admin\service\SystemService::__ca in /data/wwwroot/all_database.php on line 51