Those are all the Severity 3 errors.

The last thing I did was add medical droids. When it started crashing, I removed them all and it still crashes.

All you did since your map worked last was add droids? Do you, by any chance, have doors from the shipped Kamino (or animated doors of any sort) in your map?

I have the doors that are on space levels, but those worked fine before it started crashing.

And you're sure you didn't change anything else?

Try removing those doors as a test (back up your world1 folder first so you can easily replace it again if they aren't an issue). I know the one time I got that error, it turned out to be a door-related issue.