I tried this on my original copy of RoF2 that I got legitimately from Steam years ago. I do get the same message when typing /friends on my own local server when UCS isn't running/configured properly, but not constantly. I don't get this error on the official PEQ server, and the friends list works fine on there. After setting up UCS, everything works fine on my local server as well.
Not sure what your issue is, but I hope you figure it out.
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