SO I have both Alien Walls and RSO 2.0.8, which adds Alien Walls support, but when making a new world, it gives an error that says that there's no config for Alien Walls/Matter.
Tested it with only Alien Walls and with more mods - works for me in both cases.
Are you sure that all mods are properly enabled?
I will need more info to debug this - what mods are you using etc.
Thats a very long list.. can you test on your side with only RSO and Alien Wall and see if it works?
If that will work then can you try adding mods in batches to narrow down which of them is causing the issue?
It might be some interaction between mods and it's a lot of them for me to test all.
