[External Server Error]

Whenever I try to join my external feather server (from minehut) I get an error:

It works fine when I join from the ip but it just doesn't work on minehut can someone help me get the right files/config settings for anything to fix this I've done everything and the velocitypowered link didn't help either

[GMCkits]

Hi does anyone from the admin kit community remember GMCkits? Well I got a solution on minehut I have made Gmckits3 and Gmckits2 but sadly gmckits2 had some bungeecord problems so I gave up on it so join gmckits3!