Header checksum illegal错误？

在SL中使用ICSharpCode.SharpZipLib插件的时候，出现这个错误：

  at ICSharpCode.SharpZipLib.Zip.Compression.Inflater.DecodeHeader()
  at ICSharpCode.SharpZipLib.Zip.Compression.Inflater.Decode()
  at ICSharpCode.SharpZipLib.Zip.Compression.Inflater.Inflate(Byte[] buffer, Int32 offset, Int32 count)
  at ICSharpCode.SharpZipLib.Zip.Compression.Streams.InflaterInputStream.Read(Byte[] buffer, Int32 offset, Int32 count)
  at System.IO.StreamReader.ReadBuffer(Char[] userBuffer, Int32 userOffset, Int32 desiredChars, Boolean& readToUserBuffer)
  at System.IO.StreamReader.Read(Char[] buffer, Int32 index, Int32 count)
  at SL.MainPage.GetTrueEncodingHtml(Stream receiveStream, Encoding& encode)
  at SL.MainPage.ResponseCallback(IAsyncResult result)
  at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClassd.<InvokeGetResponseCallback>b__b(Object state2)
  at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
  at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
  at System.Threading.ThreadPoolWorkQueue.Dispatch()
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()