Raw and Iphoto

I have just purchased a Fuji X10 and shooting in Raw they come up in iPhoto with the dreaded ! mark, what is the problem. they also will not go into Aperture.

I have never had a problem shooting Raw with Nikon, they transfer in ok, I have had to delete a lot of photos because of the ! problem, it looks like there is a

problem with Raw and Iphoto, can anyone help me.