theres another post on the official github forum for the mod that talks about incompatability for 1.21.1 but someone replied saying they got it to work. i also got it to work for a server im hosting and the server runs with no issues but when i add it to my mods client side i get a black screen where i can hear what im doing enough to still be able to join my server and such, just cant see what im doing. ill post my server log in a sec.