TypeError: App\Http\Controllers\ViewController::flush(): Return value must be of type string, null returned in file /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Controllers/ViewController.php on line 91 #0 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Controllers/ViewController.php(144): App\Http\Controllers\ViewController->flush() #1 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Controller.php(54): App\Http\Controllers\ViewController->sec() #2 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php(43): Illuminate\Routing\Controller->callAction() #3 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Route.php(259): Illuminate\Routing\ControllerDispatcher->dispatch() #4 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Route.php(204): Illuminate\Routing\Route->runController() #5 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(725): Illuminate\Routing\Route->run() #6 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(141): Illuminate\Routing\Router->Illuminate\Routing\{closure}() #7 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Middleware/InitStatic.php(33): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #8 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\InitStatic->handle() #9 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Middleware/InitFrontAutoEntry.php(23): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #10 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\InitFrontAutoEntry->handle() #11 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Middleware/InitLanguage.php(69): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #12 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\InitLanguage->handle() #13 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Middleware/InitTheme.php(35): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #14 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\InitTheme->handle() #15 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/app/Http/Middleware/InitChecking.php(141): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #16 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): App\Http\Middleware\InitChecking->handle() #17 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/Modules/Traffic/Http/Middleware/TrafficRecorder.php(24): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #18 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Modules\Traffic\Http\Middleware\TrafficRecorder->handle() #19 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php(50): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #20 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Routing\Middleware\SubstituteBindings->handle() #21 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php(78): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #22 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle() #23 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(49): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #24 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\View\Middleware\ShareErrorsFromSession->handle() #25 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(121): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #26 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(64): Illuminate\Session\Middleware\StartSession->handleStatefulRequest() #27 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Session\Middleware\StartSession->handle() #28 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #29 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle() #30 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(67): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #31 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Cookie\Middleware\EncryptCookies->handle() #32 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #33 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(726): Illuminate\Pipeline\Pipeline->then() #34 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(703): Illuminate\Routing\Router->runRouteWithinStack() #35 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(667): Illuminate\Routing\Router->runRoute() #36 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Routing/Router.php(656): Illuminate\Routing\Router->dispatchToRoute() #37 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(190): Illuminate\Routing\Router->dispatch() #38 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/www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Foundation\Http\Middleware\PreventRequestsDuringMaintenance->handle() #49 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Http/Middleware/HandleCors.php(49): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #50 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Http\Middleware\HandleCors->handle() #51 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Http/Middleware/TrustProxies.php(39): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #52 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(180): Illuminate\Http\Middleware\TrustProxies->handle() #53 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(116): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}() #54 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(165): Illuminate\Pipeline\Pipeline->then() #55 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(134): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter() #56 /www/wwwroot_disk_vdb/ensunyuanbiotechcom/public/index.php(93): Illuminate\Foundation\Http\Kernel->handle() #57 {main}