GdkError !!

["M.N.S.S.K.Pavan Kumar" <pavan gdit iiit net>]

Hi,	
	I am trying to draw a pixmap on another pixmap and trying to
display the second one !
	The problem is , second one is being created well but for the
first one, the following error is being given ,,

	GdkWarning **:Creating pixmap from NULL window and colormap
Can anyone explain me what this means , 
	
	thanking you in anticipation,
regards
pavan