Dimension Provider error
https://image.prntscr.com/image/ktoQ46jjRXWoe6jReswleQ.png
This error pops up when trying to create a world using bukkits WorldCreator class. I believe, and I admit I could be wrong on this, that Forge enforces a dimension provider for all dimensions created where it stores various objects on that worlds dimension ID and other information. Bukkit handles things differently and doesn't have any such thing as a dimension provider. In previous itterations of both Cauldron and Thermos this was handled behind the scenes by providing the Forge code with a populated Dimension Provider using the Bukkit methods for capturing the information.
If Atom is currently lacking any kind of default dimension provider to handle cases like this than I doubt any world creation plugins are going to work in the near future which is a bit of a problem for server owners looking to create spawn in worlds and the like a bit more easily.