Error spam in server logs

What it says on the tin. running on a 1.21.4 fabric server with c2me, lithium, and nochatreports. everything else should be vanilla. a few players playing, likely without a DH client.

Is there a way I can set it to just ignore errors? they don't appear to be causing any problems, though I have not tried to connect with a DH client to check if it's working or not.

Additionally, would love a

/dh help

/dh help

and

/dh help config

/dh help config

and whatnot. I have not been able to figure out a single working command from the docs