Error updating

[Plumeno]

Heya,maybe someone help me?

Unknown Error: mscorlib
at System.IO.__Error.WinIOError(Int32 errorCode, String str)
at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)
at System.Security.Cryptography.HashAlgorithm.ComputeHash(Stream inputStream)
at WindowsApplication7.Form1.GetFileMD5(String FilePath)
at WindowsApplication7.Form1.DownloadExtras()
at WindowsApplication7.Form1.DoUpdates()
at WindowsApplication7.Form1.Timer3_Tick(Object sender, EventArgs e)
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.Callback(IntPtr hWnd, Int32 msg, IntPtr idEvent, IntPtr dwTime)Błąd danych (CRC).