DOOM 3 "Client unknown to auth" Multiplayer error [Solved] .

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I was trying to play Doom 3 online with some of my friends but each time I try to connect to any server I get "Client Unknown to auth" error, I have a legit steam copy with it's expansion "Resurrection of Evil".

Edited January 8, 2019 by tempdecal.wad

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Any Solution guys ?

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Ok i fixed it, i used Revouninstaller to remove the entire game with all the leftovers (CD-Keys, Reg files,Cache ... etc) then reinstalled the game, It worx fine now :)