"....are not signed byn a key accepted by this server" Error

[phienyx 14]

As soon as I notice that there was a new version (1.71.1) I cleared out my @Dayz\addons folder, downloaded the 7 new .rar files from the SWE download mirror on the DayZ website and installed them as I had installed the 1.6 and 1.7 files.

Upon attempting to connect to any of the 1.7.1 servers running, I continually receive the following error message:

Files "C{\program files (x86\steam\steamapps\common\arma 2 operation arrowhead\@Dayz\addons\dayz.pbo", "C:\program files (x86)\steamapps\common\arma 2 operation arrowhead\@DayZ\addons\dayz_sfx.pbo" are not signed by a key accepted by this server. To play on this server, remove listed files or install additional accepted keys.

I am assuming I can simply delete those files or do they need to be replace with other files?

[fml 29]

I would re-download the files and replace them with the same files.

[ChuckBanger 0]

I get the same error message when i try to join a server. I used Six Updater to update the game.