Can't Play DayZ

[Runecape143 0]

Every server I try to play won't let me join, it keeps popping up with an error reading:

 

Files "addons\dk_160thsoar_pilot.pbo", "addona\orrn_dbo_mh60l_fastrope.pbo","addons\rktf15c.pbo", "addons\uh60.pbo","addons\yup_bhsounds.pbo" are not signed by a key accepted by this server. To play on this server, remove listed files or installed additional accepted keys.

 

This error appears on every server I attempt to join. Halp me please.

[XibaRootS 40]

do a backup of this files, delete them and try join the server again. If you can't, do a repair of the files from arma 2 and all expansions and the mod too.

[Runecape143 0]

Same issue still, though maybe it'll help to tell you that when I start up the game it says:

 

Addon 'RKTf15' requires addon 'Extended_EventHandlers'

 

I don't know what RKTf15 is or why its there.

[Runecape143 0]

After much research I've solved my problem, any addons people have manually installed will ruin their games ability to connect