updata error?

[earl100]

File: map_fprt_adv04_ruins.dds
System
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Net.OSSOCK.WSARecv(IntPtr socketHandle, WSABuffer& Buffer, Int32 BufferCount, IntPtr bytesTransferred, SocketFlags& socketFlags, IntPtr overlapped, IntPtr completionRoutine)
at System.Net.Sockets.Socket.BeginReceive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, AsyncCallback callback, Object state)
at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.Connection.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.InternalBeginRead(Int32 bytesToRead, NestedSingleAsyncResult castedAsyncResult, Boolean fromCallback)
at System.Net.ConnectStream.BeginReadWithoutValidation(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at WindowsApplication7.DownloadWorker.DownloadFile()Unable to read data from the transport connection.
File: map_fprt_sewer03_0.dds
System
System.NullReferenceException: Object reference not set to an instance of an object.
at System.Net.OSSOCK.WSARecv(IntPtr socketHandle, WSABuffer& Buffer, Int32 BufferCount, IntPtr bytesTransferred, SocketFlags& socketFlags, IntPtr overlapped, IntPtr completionRoutine)
at System.Net.Sockets.Socket.BeginReceive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, AsyncCallback callback, Object state)
at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.Sockets.NetworkStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.Connection.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.InternalBeginRead(Int32 bytesToRead, NestedSingleAsyncResult castedAsyncResult, Boolean fromCallback)
at System.Net.ConnectStream.BeginReadWithoutValidation(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at WindowsApplication7.DownloadWorker.DownloadFile()Unable to read data from the transport connection.

what wrong with it?