iMovie: Incompatible Camera video format...?

I just got a new Sony HDR-HC3 camcorder and at first it would easily put the movies right onto iMovie witht he firewire. I could control the cam through my computer. But now, for some reason it will not connect. It comes up with an error message that says:

Incompatible Camera Video Format

The attached camera uses a different video format than your project's
format. To use this camera, disconnect any other tape-based cameras,
then create a new, empty project.

I did what it said ( I had no other "tape based cameras"), I closed it, and made a new empty project. Same error happened. I did not make any changes to the camera or my macbook, maybe something I did by an accident...
Can anybody help me out?
Thanks,
Connor

What video format are you using when you create a new project?

I am not sure, does HDV1080i sound right?

When you create a new project, you're given the choice of format. Make sure it's the right one.

ya 1080i is right for your camcorder

Okay, I got the camera to say it is connected and everything but now when I press play, it does not show any video so I can't import anything. It shows the video on the camera's display though. I also saw that it said it does not have the quicktime software necessary to view and edit HDV film, however as I said everything workded fine the first time.

You have set the camera to VCR mode and selected import in the iMovie window right?

yea, thats right and i've done that