The-Aether-II
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Cant start Server without deleting world and let it generate new one.
https://pastebin.com/RmcCHzCt
I'd guess it's related to updates in world gen.
Some way too fix it without deleting my world?
Not usually. Make sure that you aren’t/haven’t been running any other mods besides Aether II. You should be trying to boot the world with the same Minecraft but with an updated Aether.