This is the error message I am getting. I try to open Lightroom back up and I get a similar error message saying it's corrupt and I can't open the catalog. I started having the issue when my Mac Air froze and I had to force it to shut down. I'm able to open the catalog up if I rename it or move it, I just can't edit the photos (or it freaks out), but I have been able to export (luckily could export the wedding I had just finished editing). Any suggestions on what I could do to fix the catalog would be much appreciated, so I don't have to re-edit ALL the photos! Or should I just try to export the photos as DNG and upload them to a new catalog? Then they would be raw files AND edited.