Problem Can't launch SkyFactory 3

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jezza3839

New Member
Feb 7, 2021
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I downloaded SkyFactory 3 and I had been using it for a few days. Occasionally it would crash on me but it would start back up when I re-launched it. I started using a server so I could play with my friend, and it worked perfectly all of yesterday, but today I was playing on our island by myself when a skeleton horse spawned and was struck by lightning and spawned all these skeleton jockeys. Ever since that, I can't log into any world or the server as it crashes when I try to join them. Then, it comes up with this message

The game crashed whilst unexpected error
Error: java.util.ConcurrentModificationException
Exit Code: -1

I've tried everything, restarting my computer, deleting and redownloading the modpack profile, deleting and redownloading curseforge, allocating more RAM, deleting these files in the %appdata%, but it still won't work and it's super frustrating.

Any help would be super appreciated :)

Thank you !!