'fopen failed to open stream: Is a directory ' after deploy using Envoyer

I'm using File Storage laravel facade to upload file provided by user. Its working perfect in development environment but after deploy using Envoyer the following error is occurred.

ErrorException in FilesystemAdapter.php line 119:
fopen(/var/www/beta/beta.example.org/releases/20170515142152/public): failed to open stream: Is a directory
in FilesystemAdapter.php line 119
at HandleExceptions->handleError('2', 'fopen(/var/www/beta/beta.example.org/releases/20170515142152/public): failed to open stream: Is a directory', '/var/www/beta/beta.example.org/releases/20170515142152/vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemAdapter.php', '119', array('path' => 'android_ios_apps/example-sysadmin/Android/test app/', 'file' => object(UploadedFile), 'name' => '1494858561744_apkpure.com (2).apk', 'visibility' => null))
at fopen('/var/www/beta/beta.example.org/releases/20170515142152/public', 'r+') in FilesystemAdapter.php line 119
at FilesystemAdapter->putFileAs('android_ios_apps/example-sysadmin/Android/test app/', object(UploadedFile), '1494858561744_apkpure.com (2).apk') in Application.php line 121
at Application::storeApplicationFiles(object(Application), object(Request), object(Client)) in ApplicationController.php line 128
at ApplicationController->newApp(object(Request))
at call_user_func_array(array(object(ApplicationController), 'newApp'), array(object(Request))) in compiled.php line 9584
at Controller->callAction('newApp', array(object(Request))) in compiled.php line 9611
at ControllerDispatcher->dispatch(object(Route), object(ApplicationController), 'newApp') in compiled.php line 8665
at Route->runController() in compiled.php line 8646
at Route->run(object(Request)) in compiled.php line 8355
at Router->Illuminate\Routing\{closure}(object(Request)) in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in AccessControlMiddleware.php line 26
at AccessControlMiddleware->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Subscription.php line 25
at Subscription->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Conditions.php line 39
at Conditions->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 3285
at FrameGuard->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in IsActiveUserMiddleware.php line 25
at IsActiveUserMiddleware->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 10177
at SubstituteBindings->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in Authenticate.php line 43
at Authenticate->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 3312
at VerifyCsrfToken->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 13749
at ShareErrorsFromSession->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 12155
at StartSession->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 13495
at AddQueuedCookiesToResponse->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 13432
at EncryptCookies->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 10054
at Pipeline->then(object(Closure)) in compiled.php line 8356
at Router->runRouteWithinStack(object(Route), object(Request)) in compiled.php line 8347
at Router->dispatchToRoute(object(Request)) in compiled.php line 8338
at Router->dispatch(object(Request)) in compiled.php line 2575
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request)) in Pipeline.php line 53
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in HandleCors.php line 34
at HandleCors->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 3374
at CheckForMaintenanceMode->handle(object(Request), object(Closure)) in compiled.php line 10069
at Pipeline->Illuminate\Pipeline\{closure}(object(Request)) in Pipeline.php line 33
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in compiled.php line 10054
at Pipeline->then(object(Closure)) in compiled.php line 2519
at Kernel->sendRequestThroughRouter(object(Request)) in compiled.php line 2503
at Kernel->handle(object(Request)) in index.php line 53

Let me know if you want more info.