Error while updating

[yabusame]

1.2.10 Unknown Thread Error: mscorlib
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access)
at EQ2MAP_Updater.MainWindow.GetFileMD5(String strFilePath)
at EQ2MAP_Updater.MainWindow.DownloadUpdates()
at EQ2MAP_Updater.MainWindow.GetUpdates()
at System.Windows.Forms.Timer.OnTick(EventArgs e)
at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)The process cannot access the file 'C:\Users\Public\Daybreak Game Company\Installed Games\EverQuest II\UI\DarqUI_v3\images\maps\map_wailingcaves_1.dds' because it is being used by another process.