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(1/1) ErrorException

Undefined index: HTTP_ACCEPT_LANGUAGE

in AppServiceProvider.php (line 60)
at HandleExceptions->handleError(8, 'Undefined index: HTTP_ACCEPT_LANGUAGE', '/home/collaborative_laravel/app/Providers/AppServiceProvider.php', 60, array('languages' => object(Collection)))in AppServiceProvider.php (line 60)
at AppServiceProvider->active_language(object(Collection))in AppServiceProvider.php (line 26)
at AppServiceProvider->boot()
at call_user_func_array(array(object(AppServiceProvider), 'boot'), array())in BoundMethod.php (line 30)
at BoundMethod::Illuminate\Container\{closure}()in BoundMethod.php (line 87)
at BoundMethod::callBoundMethod(object(Application), array(object(AppServiceProvider), 'boot'), object(Closure))in BoundMethod.php (line 31)
at BoundMethod::call(object(Application), array(object(AppServiceProvider), 'boot'), array(), null)in Container.php (line 539)
at Container->call(array(object(AppServiceProvider), 'boot'))in Application.php (line 788)
at Application->bootProvider(object(AppServiceProvider))in Application.php (line 771)
at Application->Illuminate\Foundation\{closure}(object(AppServiceProvider), 15)
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(ServiceProvider), object(AppServiceProvider), object(AuthServiceProvider), object(EventServiceProvider), object(RouteServiceProvider)), object(Closure))in Application.php (line 772)
at Application->boot()in BootProviders.php (line 17)
at BootProviders->bootstrap(object(Application))in Application.php (line 208)
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 57)