Most likely tektopia requires ATLEAST 2835, so try updating. Does it happen on one world or are others affected?
You think it would work with others? for some reason I have a feeling that my friend tried newest forge but it didnt load the mod or something.
This happens on overworld, we havent even reached to nether or end yet. Its brand new world.
Its just that we cant really explore almost at all, new chunk generation shuts down server with that error. Luckily I have automatic restart if the server crashes so I dont have to be around to start it up again.
I updated to the latest forge and I am going to test it now, will edit again once I find out what happens
Ok seems like the forge was the issue indeed. I dont know why or what my friend had done when he tested all these, he couldnt upgrade to newer forge. Most likely he did something wrong with it because mine updated and works now fine without the crash.