FCPX Missing Files from Sony EX-30

Having issues with Final Cut X, working with Sony Ex-3/Ex-30. I shot a 1 hour, six minute video on a S x S adapter card (64GB Sony SDXC I) and imported into FCPX via the EX-30. On the timeline, I made a number of blade cuts on the one hour video so I could do color correction to each segment.

The next day, I began to lay cutaways (shot with a Panasonic HMC 150) above the master EX-3 video. I then started receiving a “disk full” message. I deleted unnecessary files from other projects, but did not delete the files associated with this shoot. I did rename the master video file in FCPX library, while connected to the EX-30.

I closed FCPX, came back to work on it a few hours later, and the main file on the timeline showed “Missing Camera”. (offline)

How do I retrieve the missing file?