Please see crash report below, im using win 7 machine, Need help to reslove this, so that i can make changes to make use of style sheet

Report Start ----------------------------------

Report Type: Exception

Generated At: Wednesday, April 25, 2012   12:07:34 PM  on  Machine: IE1ALT66R5ZR1

Environment Info
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Platform: Win32NT
Version: 6.1.7600.0
Working Set: 108650496
CLR Version: 2.0.50727.4963

Application Info
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Name: NetAdvantage AppStylist for Windows Forms
Infragistics Shared Assembly Version: 11.1.20111.1003

Message
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Object reference not set to an instance of an object.

Source
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System.Drawing

Target
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op_Implicit

Stack Trace
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   at System.Drawing.Printing.PrintController.SafeDeviceModeHandle.op_Implicit(SafeDeviceModeHandle handle)
   at System.Drawing.Printing.PrintController.CreatePrintPageEvent(PageSettings pageSettings)
   at System.Drawing.Printing.PrintController.PrintLoop(PrintDocument document)
   at System.Drawing.Printing.PrintController.Print(PrintDocument document)
   at System.Drawing.Printing.PrintDocument.Print()
   at Infragistics.Win.Printing.UltraPrintPreviewControl.GeneratePreviewHelper(Boolean synchronous)
   at Infragistics.Win.Printing.UltraPrintPreviewControl.OnApplicationIdle(Object sender, EventArgs e)
   at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(ApplicationContext context)
   at Infragistics.Win.AppStyling.Runtime.AppStylistDialog.Main(String[] commandLineArgs)

Report End ----------------------------------