值不在预期范围内.在c#中绑定JSON对象时

我正在测试来自MovieDB的连接，并将电影数据绑定到两个参数。但是我只得到这个错误:

"值不在预期范围内"。

我不知道为什么这个错误被抛出…任何想法吗?

如果我在MovieList.ItemsSource = deserialized之前设置一个断点，我可以看到它包含了来自电影的所有数据…

<StackPanel>
    <ListBox x:Name="MovieList" Height="532">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding original_title}" 
                 Margin="0,0,12,0" />
                    <TextBlock Text="{Binding poster_path}"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</StackPanel>

---

private async void KopplaDB()
{
     var baseAddress = new Uri("https://api.themoviedb.org/3/");
     var key = "?api_key=*************************************";
     using (var httpClient = new HttpClient { BaseAddress = baseAddress })
     {          
          httpClient.DefaultRequestHeaders.TryAddWithoutValidation("accept", "application/json");
          using (var response = await httpClient.GetAsync("movie/550" + key))
          { 
              string responseData = await response.Content.ReadAsStringAsync();
              var deserialized = JsonConvert.DeserializeObject<Movie>(responseData);
              MovieList.ItemsSource = deserialized;
          }
     }
}

电影类:

class Movie
{  
    public bool adult { get; set; }
    public string backdrop_path { get; set; }
    public object belongs_to_collection { get; set; }
    public int budget { get; set; }
    public List<Genre> genres { get; set; }
    public string homepage { get; set; }
    public int id { get; set; }
    public string imdb_id { get; set; }
    public string original_language { get; set; }
    public string original_title { get; set; }
    public string overview { get; set; }
    public double popularity { get; set; }
    public string poster_path { get; set; }
    public List<ProductionCompany> production_companies { get; set; }
    public List<ProductionCountry> production_countries { get; set; }
    public string release_date { get; set; }
    public int revenue { get; set; }
    public int runtime { get; set; }
    public List<SpokenLanguage> spoken_languages { get; set; }
    public string status { get; set; }
    public string tagline { get; set; }
    public string title { get; set; }
    public bool video { get; set; }
    public double vote_average { get; set; }
    public int vote_count { get; set; }
}

<StackPanel>
<ListBox x:Name="MovieList" Height="532">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding original_title}" 
             Margin="0,0,12,0" />
                <TextBlock Text="{Binding poster_path}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding original_title}" 
             Margin="0,0,12,0" />
                <TextBlock Text="{Binding poster_path}"/>
            </StackPanel>

this.DataContext = movieItem;