IO Error: cannot assign "builtin" because "plugin" is null

So I recently got into modding using MCreator, and I've been hoping to try loading the fabric generator addon. Unfortunately, despite following all the steps for downloading and adding an addon to MCreator, the addon keeps failing to load. The error message I get says "IO Error: cannot assign "builtin" because "plugin" is null. I am making a post about this because I have found a few reddit posts, and even a forum post here talking about this, but no proper solution is provided.