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You did check whether you were starting the right server, right? Somehow sounds like you started the minecraft server instead of the forge server...
Please find the following file in your Skyfactory 3 modpack folder:
island.json
May be islands.json
Delete it. Try to start your world again after that.
This may or may not help.
In case the file doesn't exist, please create a txt file, name it island.json and add the following line:
{...
Please find the following file in your Skyfactory 3 modpack folder:
island.json
May be islands.json
Delete it. Try to start your world again after that.
Yeah, that island.json file is likely still empty. Please put the following line in the json file:
{ "spawn": { "playerName": "default_island", "playerId": null, "islandName": "spawn_island", "posX": 0, "posY": 66, "posZ": 256 }}
Just me wondering here, but did your server not shutdown cleanly? As in, did it suddenly stop due to a power outage or something like that?
Been trying to figure out how exactly this error pops up.