Cannot edit lightroom 2 photo in photoshop elements 9, help please.

I am using OS 10.6.5. I have Lightroom 2.7 installed and I just purchased Photoshop Elements 9. I am trying to edit my Lightroom photos in Elements by going to the menu, selecting photos and then the Edit In, but I am not able to select any of the options as they are grayed out. I have uninstalled and re-installed both programs and that has not helped. Any suggestions?  Let me know if more info is needed.

Thanks,

Sam