Can't fill an area

Hi, 

I know very little about CorelDraw but need to use it to create something at work. I cannot fill an area and it's driving me mad! I have been able to fill an area on another image and I don't know what I'm doing wrong. The image is an .ai file. I've tried smart fill, I've tried closing the curve, I've tried connecting the edges to create a rectangle - nothing seems to be working!

Anyone have any ideas how I can fill this? 

Thanks, 

Megan