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If someone else had no problem, maybe it's on my end,
I'll find a solution for now.
https://gtm.steamproxy.vip/app/232090/discussions/1/1697169163406132038/
I deleted the cache, didn't work either
But if there's still an error (Documents\My Games\KillingFloor2\KFGame\Cache) Try deleting the correct folder for the workshop number from the cache folder and loading the command.
If the error occurs again even if I do so, I'll look for a solution first.