Yea, I checked both debug logs.
But Since I'm by no way an expert or have much experience, heres both logs.
https://gist.github.com/MKr4zy/7514528cff9918fad07cb84924e70be6 (client)
https://gist.github.com/MKr4zy/e0ee4609ffcb1e95c7dfa998e7f4fe54 (server)
I've also tried to remove rubidium and rubidiumExtra, bot to no avail.
By the way, this is my first real modpack that I work on. So incase you see any big mistakes, feel free to let me know, since I'd love to learn.