I receive a prompt that I need to be an OP whenever I try to bring the GUI up even though I am already an OP. I've tried to deop and reop myself, delete the op.json file on the server then recreate it to make a new one.

The mod was added a week after creating the server. I am running the server on the same computer I am playing on as well.

debug.log

Currently requires OP permission level 4. Make zure you have that.

Will go down to 2 in the next update.

Oh I see, thank you. My OP permission was set to level 3.