Plutonium

Still not solved

It says "Incompatible UI Version" ?
Can't find it in the fix

Hey!

Me and my 2 friends are trying to play the map "Buried" on BO2 Zombies, but all we are getting greeted with is "exe client field mismatch".
All 3 of us have tried hosting but the same issue occurs.
We have tried re-installing and other tricks we searched for on youtube & google but nothing have worked.
Hope to get some help so we can have some fun on Buried.

Best regards,
Yugo