Azure Blob存储下载失败

Question

我正在尝试下载我在Azure Blob Storage中为我的WP8.1 Silverlight应用程序提供的简单XML文件。虽然它不适用于我老式的Lumia 520。它适用于我尝试过的所有其他手机和模拟器。这是失败的代码行：

myXmlDoc.LoadXml(await myBlobStorageAccount.CreateCloudBlobClient().GetContainerReference("tileinfo").GetBlockBlobReference("test.xml").DownloadTextAsync());

以下是错误：

Exception thrown: 'System.IO.FileNotFoundException' in mscorlib.ni.dll
Exception thrown: 'System.Net.WebException' in System.Windows.ni.dll
Exception thrown: 'System.Net.WebException' in System.Windows.ni.dll
Exception thrown: 'System.Net.WebException' in    Microsoft.WindowsAzure.Storage.ni.DLL
Exception thrown: 'Microsoft.WindowsAzure.Storage.StorageException' in Microsoft.WindowsAzure.Storage.ni.DLL
Exception thrown: 'Microsoft.WindowsAzure.Storage.StorageException' in Microsoft.WindowsAzure.Storage.ni.DLL
Exception thrown: 'Microsoft.WindowsAzure.Storage.StorageException' in mscorlib.ni.dll

任何人都知道这里发生了什么？电话正在运行8.10.12400.899。