and also this:
3.5.2021 19:21:53 [Fatal] System.Exception: This save game requires world generator standard but no such generator was found! I cannot continue like this, sorry :(
If you really need the contents of the save game, build a tiny mod that registers such world generator that just generates air blocks
w Vintagestory.Server.ServerSystemSupplyChunks.LoadWorldgenHandlerAndSpawnChunks()
w Vintagestory.Server.ServerMain.EnterRunPhase(EnumServerRunPhase runPhase)
w Vintagestory.Server.ServerMain.Launch()
w _ISiSTzGmXXpAqo3PzdxdVD1bClZ._WpGAXiVoJmxWu1fCRjqBgmcU7Y8()