MethodNotAllowedHttpException in RouteCollection.php Laravel 5.2

I´m Working with my project in Local and Probe Server and it does work Fine! But in Production Server I cant use post Method. I have realized this little example to try find the Error.

Controller

class PruebaControladorController extends Controller {
public function holamundo() {

    return view('holamundo');
}
public function holamundopost() {

    dd('Hola Mundo POST');
}

}

View

Formulario<br>

<form action="" method="POST" id="signin-form_id" >
    {!! csrf_field() !!}

    campo : <input type="text">
    <input type="submit">

</form>

Routes File

Route::get('entrada', 'PruebaControladorController@holamundo');
Route::post('mandadatos', 'PruebaControladorController@holamundopost');

I can acces to GET Method but POST Method launch this error.

MethodNotAllowedHttpException in RouteCollection.php line 218:

at RouteCollection->methodNotAllowed(array('POST')) in RouteCollection.php line 205
at RouteCollection->getRouteForMethods(object(Request), array('POST')) in RouteCollection.php line 158
at RouteCollection->match(object(Request)) in Router.php line 821
at Router->findRoute(object(Request)) in Router.php line 691
at Router->dispatchToRoute(object(Request)) in Router.php line 675
at Router->dispatch(object(Request)) in Kernel.php line 246
at Kernel->Illuminate\Foundation\Http\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 52
at Pipeline->Illuminate\Routing\{closure}(object(Request)) in CheckForMaintenanceMode.php line 44
at CheckForMaintenanceMode->handle(object(Request), object(Closure))
at call_user_func_array(array(object(CheckForMaintenanceMode), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136
at Pipeline->Illuminate\Pipeline\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32
at Pipeline->Illuminate\Routing\{closure}(object(Request))
at call_user_func(object(Closure), object(Request)) in Pipeline.php line 103
at Pipeline->then(object(Closure)) in Kernel.php line 132
at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 99
at Kernel->handle(object(Request)) in index.php line 54

Thank for your HELP!

via Chebli Mohamed