Of course it says bad_rcon . Your making the player enter the incorrect rcon password.
Are you trying to change the rcon password there or deliberately force an inccorect password so the player can no longer use rcon ( in which case I do not understand why your asking )? I wouldn't recommend this - I'm not certain about it, but an admin could get banned from the server by inputting the incorrect rcon password multiple times.
Why not just use server_cmd() ?
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