[2021] Persistent error message: Array Index Out of Range.

The error mentions TreeUnlimiter, I'm guessing that's Unlimited Trees mod, so try unsubscribing the mod for now (unsubscribe, not just disable).

Best suggestion I have at this point then is add Save Our Saves and SafeNets. Enable both mods, restart the game, then enable all the Safe Mode options from the Loading Screen mod and try loading your save (have 81 tiles enabled at this point too, so that missing doesn't break things).

https://steamcommunity.com/sharedfiles/filedetails/?id=529129546
https://steamcommunity.com/sharedfiles/filedetails/?id=1620588636