remove listed files or install additonal accepted keys.?

[Cabbage (DayZ) 0]

Hello all I am trying to get this mod to run but I'm having some problems. Every server I try and join gives me this message.

Files "c:\program files (x86)\steam\steamapps\common\arma2\addons\chu_undead.pbo", "c:\program files (x86)\steam\steamapps\common\arma2\addons\chn_undead_misc.pbo" are not signed by a key accepted by this server. To play on this server, remove listed files or install additonal accepted keys.

Any one got any Ideas on how I can get this mod work? Thanks.

[Rakkasan 23]

Well first thing I would do is look and see if that is in the folder. I just checked my folder and I do not have that file in it...not sure where you downloaded the mod from but it seems to me that file is not part of the dayz mod. Or are you downloaded the other mod listed up above?

[Cabbage (DayZ) 0]

Well I downloaded the mod right form the site followed all the instructions in the video. Also when I look in the folder the two files are not there nor are they in the download section. The files I have in the @DayZ\addons are:

dayz.pbo.dayz.bisign

dayz_anim.pbo.dayz.bisign

dayz_code.pbo.dayz.bisign

dayz_equip.pbo.dayz.bisign

dayz_sfx.pbo.dayz.bisign

dayz_vehicles.pbo.dayz.bisign

dayz_weapons.pbo.dayz.bisign

dayz.pbo

dayz_anim.pbo

dayz_code.pbo

dayz_equip.pbo

dayz_sfx.pbo

dayz_vehicles.pbo

dayz_weapons.pbo

In game menu also says arma 2 @dayz so I think I have it installed right. Just cant join any games. Is there a way to play single player?