Windows Phone 8.1（XAML）最新SDK的ServerSide错误

您好。

我正在尝试将广告集成到我当前的项目中，但在关注Windows Phone 8.1（XAML）入门之后，我得到了一个奇怪的例外：

I'm trying to integrate ads into my current project, but after following the get started for Windows Phone 8.1 (XAML) I get a weird exception:

Microsoft.Advertising.Mobile.Common.AdException：参数的值无效（名称：w）。

Microsoft.Advertising.Mobile.Common.AdException: Invalid value for parameter (Name: w).

与ErrorCode：ServerSideError一起。

Together with the ErrorCode: ServerSideError.

用于adcontrol的xaml是：

The xaml used for the adcontrol is this:

<ads:AdControl x:Name="msAds"
   Height="50"
   Width="320"
   VerticalAlignment="Top"
   Canvas.ZIndex="98"
   ApplicationId="test_client"
   AdUnitId="Image320_50"
   AutoRefreshIntervalInSeconds="60"
   IsAutoRefreshEnabled="True" 
   Visibility="{Binding IsTrial, Converter={StaticResource TrueToVisible}}"
   CountryOrRegion="en-US"/>

编辑：由于John Gao的回复更新了XAML

Updated the XAML due to reply from John Gao

这个代码有什么问题吗？

Is there anything wrong in this code at all?

问候

Izaac

Regards
Izaac