这个错误类型是什么？

comperssni

2012-12-09 17:42:29,314 [1] ERROR System.Object [(null)] - UI Exception:
System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
   at System.Drawing.Graphics.Clear(Color color)
   at csExWB.cEXWB.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at csExWB.cEXWB.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)