getting error when add skydiver/laravel-flysystem-b2

getting error when add skydiver/laravel-flysystem-b2

ReflectionException in Container.php line 741: Class filesystem does not exist

in Container.php line 741
at ReflectionClass->__construct('filesystem') in Container.php line 741
at Container->build('filesystem', array()) in Container.php line 631
at Container->make('filesystem', array()) in Application.php line 674
at Application->make('filesystem') in Container.php line 1167
at Container->offsetGet('filesystem') in Facade.php line 151
at Facade::resolveFacadeInstance('filesystem') in Facade.php line 120
at Facade::getFacadeRoot() in Facade.php line 205
at Facade::__callStatic('extend', array('b2', object(Closure))) in B2ServiceProvider.php line 18
at B2ServiceProvider->boot()
at call_user_func_array(array(object(B2ServiceProvider), 'boot'), array()) in Container.php line 507
at Container->call(array(object(B2ServiceProvider), 'boot')) in Application.php line 734
at Application->bootProvider(object(B2ServiceProvider)) in Application.php line 717
at Application->Illuminate\Foundation\{closure}(object(B2ServiceProvider), '2')
at array_walk(array(object(EventServiceProvider), object(RoutingServiceProvider), object(B2ServiceProvider)), object(Closure)) in Application.php line 718
at Application->boot() in BootProviders.php line 17
at BootProviders->bootstrap(object(Application)) in Application.php line 203
at Application->bootstrapWith(array('October\Rain\Foundation\Bootstrap\RegisterClassLoader', 'Illuminate\Foundation\Bootstrap\DetectEnvironment', 'October\Rain\Foundation\Bootstrap\LoadConfiguration', 'October\Rain\Foundation\Bootstrap\LoadTranslation', 'October\Rain\Foundation\Bootstrap\ConfigureLogging', 'Illuminate\Foundation\Bootstrap\HandleExceptions', 'Illuminate\Foundation\Bootstrap\RegisterFacades', 'October\Rain\Foundation\Bootstrap\RegisterOctober', 'Illuminate\Foundation\Bootstrap\RegisterProviders', 'Illuminate\Foundation\Bootstrap\BootProviders')) in Kernel.php line 222
at Kernel->bootstrap() in Kernel.php line 117
at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 87
at Kernel->handle(object(Request)) in index.php line 43

ReflectionException in Container.php line 741: Class encrypter does not exist

in Container.php line 741
at ReflectionClass->__construct('encrypter') in Container.php line 741
at Container->build('encrypter', array()) in Container.php line 631
at Container->make('encrypter', array()) in Application.php line 674
at Application->make('encrypter') in Container.php line 842
at Container->resolveClass(object(ReflectionParameter)) in Container.php line 805
at Container->getDependencies(array(object(ReflectionParameter)), array()) in Container.php line 774
at Container->build('Illuminate\Cookie\Middleware\EncryptCookies', array()) in Container.php line 631
at Container->make('Illuminate\Cookie\Middleware\EncryptCookies', array()) in Application.php line 674
at Application->make('Illuminate\Cookie\Middleware\EncryptCookies') in Kernel.php line 142
at Kernel->terminate(object(Request), object(Response)) in index.php line 48