Video output and XML not working with png

I am trying out the XML option when exporting video(frames) from Unreal’ssequancer. But I can’t make it works with PNG or JPG, I read the XML file and always point out to AVi files.
This XML file can be imported into Adobe Premiere and the editing sequence is build but all the AVI show missing because I didn’t save as AVI but as an image sequence. Is there something that I am missing?
or a workaround for this?
thank you/