Fatal error: Uncaught RuntimeException: A facade root has not been set. in D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Support\Facades\Facade.php:220 Stack trace: #0 D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(396): Illuminate\Support\Facades\Facade::__callStatic('replaceNamespac...', Array) #1 D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(373): Illuminate\Foundation\Exceptions\Handler->registerErrorViewPaths() #2 D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(288): Illuminate\Foundation\Exceptions\Handler->renderHttpException(Object(Symfony\Component\HttpKernel\Exception\HttpException)) #3 D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Foundation\Exceptions\Handler.php(187): Illuminate\Foundation\Exceptions\Handler->prepareResponse(Object(Illuminate\Http\Request), Object(Symfony\Component\Ht in D:\phpstudy_pro\WWW\sxql.org.cn\vendor\laravel\framework\src\Illuminate\Support\Facades\Facade.php on line 220