Obviously you are talking RTCW which I don't play so the points i post are just educated guesses.
(1) Are you "logging" into a server? Well you must have FritzBot installed and patched on the client computer. If you log in from plain RTCW then your client won't accept the new weapon (fg42).
from the wiki:
Quote:
NOTE TO SERVER ADMINS: In the past, it was possible to run a Windows server of FritzBot that Linux and Mac clients could connect to. With the addition of the FG42 (Fritzbot version 0.53 Beta and up), and several other additions requested by the community, that is no longer possible. Anyone that connects to a FritzBot server will also have to be running the mod.
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(2) If you are hosting and you get that error I suspect you don't have FritzBot properly installed and patched or your installation is corrupt.
Can't help much more than that, Crapshoot likely knows, try PMing him.