Files"G:Steam........@RH_pistols\addons\rh_de.pbo are not signed by a key accepted by this Server.
To play on this Server remove additional files or install additional accepted keys.
If someone wonders:
Yes I uploaded the key in the keys folder, also there are the 2 bisign-keys for the addons in the addons-folder.
and yes I installed a duplicate of the File A3L installed on my Client, so my/our keys HAVE to be the same.