error 191

[pulsar aspen]

minecraft version: 1.20.1
i added the create mod and when i open a world in the chat pops up this error
i use forge
thanks for everything

[shrewd walrus]

You didn't select a Minecraft version or ModLoader tag! Please select both and re-submit your post!

[sage hearth]

Paste version of server.log from @pulsar aspen