Geyser Trouble on Velocity Proxy

hey guys! running a Velocity Proxy with a Cobblemon 1.21.1 server and a vanilla 1.21.7 server! i know that bedrock players would never be able to join the cobblemon server, but as for the vanilla 1.21.7 server, i'd like to enable geyser for it. i have geyser on the velocity proxy now and floodgate on the backends, but i keep getting this error here. wondering how i can fix. thanks!