To solve the same error for a treeview, I put this in imagelist.Init:

  This.object.listimages.add(1,,LoadPicture("C:\VFP6LIB\bitmaps\closed1.gif"))
  This.object.listimages.add(2,,LoadPicture("C:\VFP6LIB\bitmaps\open1.gif"))

I put the imagelist in a container, then (in my case) the treeview in the same container. Then I put the setting of the imagelist into the treeview object from the init of the container. This makes sure the loading of the images happens after the objects have finished initializing.

HTH
>>I have an ImageList and a ListView a form.
>>
>>In the Init of the form I have:
>>
>>
>>ThisForm.oleListView.ImageList = ThisForm.oleImages
>>
>>
>>and I still get the "ImageList must be initialized..." error.
>>
>>Anyone know why?
>
>Do you load any images into ImageList during its Init? If not, you can't associate it with another control. I put the following in my Treeview/ImageList container for this purpose:

>With THISFORM
>	if type(".OleIL.ListImages") = "O" ;
>		and !isnull(.OleIL.ListImages) ;
>		and .OleIL.ListImages.Count > 0 then
>		.OleTV.ImageList = .OleIL
>	endif
>Endwith

>
>HTH.