Cannot modify header information - headers already sent by (output started at /home/smortec/public_html/index.php:1)

(1/1) ErrorException

Cannot modify header information - headers already sent by (output started at /home/smortec/public_html/index.php:1)

in web.php line 17
at HandleExceptions->handleError(2, 'Cannot modify header information - headers already sent by (output started at /home/smortec/public_html/index.php:1)', '/home/smortec/public_html/routes/web.php', 17, array('routes' => '/home/smortec/public_html/routes/web.php', 'router' => object(Router)))
at header('Cache-Control: no-cache, must-revalidate')in web.php line 17
at require('/home/smortec/public_html/routes/web.php')in Router.php line 417
at Router->loadRoutes('/home/smortec/public_html/routes/web.php')in Router.php line 373
at Router->group(array('middleware' => array('web'), 'namespace' => 'App\\Http\\Controllers'), '/home/smortec/public_html/routes/web.php')in RouteRegistrar.php line 121
at RouteRegistrar->group('/home/smortec/public_html/routes/web.php')in RouteServiceProvider.php line 56
at RouteServiceProvider->mapWebRoutes()in RouteServiceProvider.php line 40
at RouteServiceProvider->map()
at call_user_func_array(array(object(RouteServiceProvider), 'map'), array())in BoundMethod.php line 29
at BoundMethod::Illuminate\Container\{closure}()in BoundMethod.php line 87
at BoundMethod::callBoundMethod(object(Application), array(object(RouteServiceProvider), 'map'), object(Closure))in BoundMethod.php line 31
at BoundMethod::call(object(Application), array(object(RouteServiceProvider), 'map'), array(), null)in Container.php line 572
at Container->call(array(object(RouteServiceProvider), 'map'))in RouteServiceProvider.php line 77
at RouteServiceProvider->loadRoutes()in RouteServiceProvider.php line 36
at RouteServiceProvider->boot()in RouteServiceProvider.php line 28
at RouteServiceProvider->boot()
at call_user_func_array(array(object(RouteServiceProvider), 'boot'), array())in BoundMethod.php line 29
at BoundMethod::Illuminate\Container\{closure}()in BoundMethod.php line 87
at BoundMethod::callBoundMethod(object(Application), array(object(RouteServiceProvider), 'boot'), object(Closure))in BoundMethod.php line 31
at BoundMethod::call(object(Application), array(object(RouteServiceProvider), 'boot'), array(), null)in Container.php line 572
at Container->call(array(object(RouteServiceProvider), 'boot'))in Application.php line 819
at Application->bootProvider(object(RouteServiceProvider))in Application.php line 802
at Application->Illuminate\Foundation\{closure}(object(RouteServiceProvider), 30)
at array_walk(array(object(EventServiceProvider), object(LogServiceProvider), object(RoutingServiceProvider), object(AuthServiceProvider), object(CookieServiceProvider), object(DatabaseServiceProvider), object(EncryptionServiceProvider), object(FilesystemServiceProvider), object(FormRequestServiceProvider), object(FoundationServiceProvider), object(NotificationServiceProvider), object(PaginationServiceProvider), object(SessionServiceProvider), object(ViewServiceProvider), object(Provider), object(ExpoPushNotificationsServiceProvider), object(MapperServiceProvider), object(TrustedProxyServiceProvider), object(ShoppingcartServiceProvider), object(ImageServiceProvider), object(FlashServiceProvider), object(NexmoChannelServiceProvider), object(SlackChannelServiceProvider), object(ExcelServiceProvider), object(ServiceProvider), object(SweetAlertServiceProvider), object(ThemeServiceProvider), object(AppServiceProvider), object(AuthServiceProvider), object(EventServiceProvider), object(RouteServiceProvider), object(AdvanceSearchProvider), object(IdentifyServiceProvider), object(TranslationServiceProvider), object(HashServiceProvider)), object(Closure))in Application.php line 803
at Application->boot()in BootProviders.php line 17
at BootProviders->bootstrap(object(Application))in Application.php line 211
at Application->bootstrapWith(array('Illuminate\\Foundation\\Bootstrap\\LoadEnvironmentVariables', 'Illuminate\\Foundation\\Bootstrap\\LoadConfiguration', 'Illuminate\\Foundation\\Bootstrap\\HandleExceptions', 'Illuminate\\Foundation\\Bootstrap\\RegisterFacades', 'Illuminate\\Foundation\\Bootstrap\\RegisterProviders', 'Illuminate\\Foundation\\Bootstrap\\BootProviders'))in Kernel.php line 162
at Kernel->bootstrap()in Kernel.php line 146
at Kernel->sendRequestThroughRouter(object(Request))in Kernel.php line 116
at Kernel->handle(object(Request))in index.php line 53
at require_once('/home/smortec/public_html/public/index.php')in index.php line 22