The Windows Runtime stream that underlies this System.IO.Stream object has invoked an IO completion callback and specified ...

The Windows Runtime stream that underlies this System.IO.Stream object has invoked an IO completion callback and specified null for the IAsyncInfo instance that describes the completed IO operation. This behavior is not supported because results cannot be retrieved from a null operation. Either the underlying Windows Runtime stream has a faulty implementation, or you are using a Windows Runtime object in an unsupported runtime environment.