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Hey CluckyCow, ahh that's a shame! Are you using the "Standalone Server" option when launching the game from the itch client? If so you don't have to - just start a new game and click "Host". If you still get the error it might be that the executable "Gravity.Server.exe" is still running in the background (you may have to use task manager to kill it) - this happens if the client crashes. Let me know how you get on :)

OK I stopped the task and it is working now.  Thank you