Are you using a Hackintosh? The details in your log don't match up.
If you have months of work on a very long movie, I hope you are doing occasional Export Project backups of your project(s). And you should do periodic database backups from the Resolve database manager.
You are using a Disk database, so there is no explicit database upgrade you need to do when updating Resolve versions.
It looks like something happened to your AUSENCIAS project on Dec. 14. You were still using 11.1.1 Lite at that point, so the probelm doesn't seem to be related to a software change. I can't tell what happened to your project,
This is the error message, but I'm not sure what might cause it: Invalid version deleted event sender detected for clip.
You might want to contact your local BMD office and send them a copy of your project file to look at.