Error accessing JSON - Xamarin Forms

Question

On the LOGIN button of my app when clicked it looks for Json information, on my Macbook with Genymotion is accessed normally, but when I will use the same code in Windows (tested on two of them) with Genymotion it gives the following error:

​

If I install on Smartphone by Windows or Macbook the access usually happens when I click ACCESS, I would like to understand where the problem might be (it gives the impression that it is somehow in Genymotion, until reinstalled and is the latest version of it and Virtualbox.

Follows the XAML:

<AbsoluteLayout>
    <Grid AbsoluteLayout.LayoutBounds="0, 0, 1, 1"
          AbsoluteLayout.LayoutFlags="All" >

        <Grid.RowDefinitions>
            <!-- Define as linhas -->
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <BoxView Grid.Row="0"
                     BackgroundColor="Bisque"/>
        <BoxView Grid.Row="1"
                     BackgroundColor="Accent"/>
        <BoxView Grid.Row="2"
                     BackgroundColor="Aqua"/>
        <BoxView Grid.Row="3"
                     BackgroundColor="Beige"/>
        <BoxView Grid.Row="4"
                     BackgroundColor="Blue"/>

        <!-- Entry's -->
        <Entry Grid.Row="2"
                   x:Name="entryEmail" 
                   Text="[email protected]"
                   FontSize="Small"
                   VerticalOptions="StartAndExpand"/>
        <Entry Grid.Row="2"
                   x:Name="entrySenha" 
                   IsPassword="True"
                   Text="123456"
                   FontSize="Small"
                   VerticalOptions="CenterAndExpand"/>

        <!-- Botões -->
        <Button Grid.Row="3"
                Text="Cadastro"
                Clicked="btnCadastrarUserAsync"
                TextColor="White"
                HorizontalOptions="Start"
                VerticalOptions="StartAndExpand"
                FontSize="Small"
                BackgroundColor="DodgerBlue"
                Margin="0"/>
        <Button Grid.Row="3"
                x:Name="btnAcessar" 
                Clicked="btnAcessar_Clicked"
                HorizontalOptions="Center"
                VerticalOptions="StartAndExpand"
                Text="Acessar"
                TextColor="White"
                FontSize="Small"
                BackgroundColor="DodgerBlue"
                Margin="0"/>
        <Button Grid.Row="3"
                Text="Sair"
                Clicked="Sair_Clicked"
                HorizontalOptions="End"
                VerticalOptions="StartAndExpand"
                TextColor="White"
                FontSize="Small"
                BackgroundColor="DodgerBlue"
                Margin="0"/>
    </Grid>

    <!-- Loading -->
    <StackLayout IsVisible="{Binding IsLoading}" 
                 AbsoluteLayout.LayoutBounds="0, 0, 1, 1"
                 AbsoluteLayout.LayoutFlags="All"  
                 BackgroundColor="DodgerBlue" 
                 Opacity="0.5">

        <!-- Loading -->
        <ActivityIndicator x:Name="actInd"
                           IsRunning="{Binding IsLoading}"
                           IsVisible="{Binding IsLoading}"
                           Color="DarkBlue"
                           HeightRequest="60"
                           WidthRequest="60"
                           BackgroundColor="Transparent"
                           HorizontalOptions="CenterAndExpand"
                           VerticalOptions="CenterAndExpand">
        </ActivityIndicator>
    </StackLayout>

</AbsoluteLayout>

Follows the Code:

using Plugin.LocalNotifications;
using FoodSuppy.Classe;
using FoodSuppy.Classe_Interface;
using SQLite;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using System.ComponentModel;

namespace FoodSuppy
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Login : ContentPage, INotifyPropertyChanged
    {
        private int _vezesTimer;
        bool isLoading = false;     //Loading

        public Login()
        {
            InitializeComponent();

            //Para se utilizar o Binding
            BindingContext = this;

            //A cada 3 segundo envia uma notificação ao smartphone
            Device.StartTimer(TimeSpan.FromSeconds(3), () =>
            {
                CrossLocalNotifications.Current.Show("Título", "Bla bla blá");
                return true;
            });

            //A cada 1 segundo passa pela instrução IF

        }

        //Botão Logado/Não Logado
        private void OnToggledSwitch(object sender, ToggledEventArgs e)
        {
            bool swtLogado = e.Value;
        }

        //Botão Acessar
        async void btnAcessar_Clicked(object sender, EventArgs e)
        {
            var retorno = new Retorno();

            bool EmailVazio = string.IsNullOrEmpty(entryEmail.Text);
            bool SenhaVazia = string.IsNullOrEmpty(entrySenha.Text);

            //Campos Entry Vazios ou Não
            if ((EmailVazio == false) && (SenhaVazia == false))
            {
                //Loading
                IsLoading = true;

                retorno = await BuscarDados.BuscaInformacao(entryEmail.Text, entrySenha.Text);

                if (retorno.COD == "1")
                {
                    var login = new Login1();

                    login.EMAIL = entryEmail.Text;
                    login.SENHA = entrySenha.Text;
                    login.LOGADO = true;
                    login.ID_USUARIO = retorno.ID_RET;

                    new LoginDataAccess().InserirLogin(login);

                    IsLoading = false; //Loading

                    await Navigation.PushAsync(new Principal_Master(login.ID_USUARIO));
                }
                if (retorno.COD == "2")
                {
                    IsLoading = false; //Loading
                    await DisplayAlert("Confira", "Senha incorreta!", "Ok");
                }
                if (retorno.COD == "3")
                {
                    IsLoading = false; //Loading
                    await DisplayAlert("Confira", "E-mail não cadastrado!", "Ok");
                }
            }
            else if ((EmailVazio) && (SenhaVazia == false))
            {
                await DisplayAlert("Verificação", "Campo e-mail vazio, preencha!", "OK");
            }
            else if ((EmailVazio == false) && (SenhaVazia))
            {
                await DisplayAlert("Verificação", "Campo de senha vazio, preencha!", "OK");
            }
            else
            {
                await DisplayAlert("Verificação", "Campos de e-mail e senha vazios, preencha!", "OK");
            }
        }

        //Botão Cadastrar Usuário
       async Task btnCadastrarUserAsync(object sender, EventArgs e)
        {
            await Navigation.PushAsync(new CadastroUsuario("1", "0"));
        }

        //Botão Sair
        private async void Sair_Clicked(object sender, EventArgs e)
        {
            var result = await DisplayAlert("Alerta", "Deseja realmente sair?", "Sim", "Não");

            if (result) System.Diagnostics.Process.GetCurrentProcess().Kill();
        }

        //Loading
        public bool IsLoading
        {
            get
            {
                return isLoading;
            }
            set
            {
                isLoading = value;
                RaisePropertyChanged("IsLoading");
            }
        }

        //Continuando sobre Loading
        #pragma warning restore CS0108 // O membro oculta o membro herdado; nova palavra-chave ausente
        public void RaisePropertyChanged(string name)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(name));
        }

        #pragma warning disable CS0108 // O membro oculta o membro herdado; nova palavra-chave ausente
        public event PropertyChangedEventHandler PropertyChanged;
    }
}

JSON:

` class BuscarDados
    {
        private static string UrlBase = "http://sibrati.com.br/foodsupply/valida_log_email_senha.php?ema={0}&sen={1}";

        public async static Task<Retorno> BuscaInformacao(string email, string senha)
        {
            string URL = string.Format(UrlBase, email, senha);

            HttpClient http = new HttpClient();

            var response = await http.GetAsync(URL);
            var content = await response.Content.ReadAsStringAsync();
            var retorno = JsonConvert.DeserializeObject<Retorno>(content);

            return retorno;
        }
    }`

After placing the Try/Catch error (requested below in the comments) its return error is as follows:

Answer 1

I believe your mistake is lack of Internet in the VM itself. As you did the tests on other Vices and they were right, and as I commented in the answer above, your code is right. So I think the problem is something more basic.

Answer 2

Your code is correct, but I advise you to use Getstringasync instead of Getasync.

public async static Task<Retorno> BuscaInformacao(string email, string senha)
{
    HttpClient httpClient = new HttpClient();
    var retorno = new Retorno();

    try
    {
        var result = await httpClient.GetStringAsync(string.Format(UrlBase, email, senha));
        retorno = JsonConvert.DeserializeObject<Retorno>(result);
    }
    catch (Exception)
    {
        //Aqui você pode tratar a sua exception. Lembrando que o erro poderá ocorrer caso o usuário fique sem acesso à internet!
        return null;
    }
    finally
    {
        if (httpClient != null)
        {
            httpClient.Dispose();
            httpClient = null;
        }
    }

    return retorno;
}