Fatal error: Uncaught Error: Call to undefined function app() in /www/wwwroot/feiniao/vendor/zzstudio/think-addons/src/helper.php:21 Stack trace: #0 [internal function]: {closure}() #1 /www/wwwroot/feiniao/vendor/topthink/framework/src/think/Container.php(376): ReflectionClass->__construct() #2 /www/wwwroot/feiniao/vendor/topthink/framework/src/think/Container.php(252): think\Container->invokeClass() #3 /www/wwwroot/feiniao/vendor/topthink/framework/src/think/Facade.php(47): think\Container->make() #4 /www/wwwroot/feiniao/vendor/topthink/framework/src/think/Facade.php(66): think\Facade::createFacade() #5 /www/wwwroot/feiniao/public/index.php(25): think\Facade::instance() #6 {main} thrown in /www/wwwroot/feiniao/vendor/zzstudio/think-addons/src/helper.php on line 21