Hello! I was perusing the settings for Bluetonium Fusion when I encountered the following startup error as a result of enabling the "Promethium fuel cell" setting:
Failed to load mods: Error in assignID: item with name 'promethium-scrap' does not exist.
Source: promethium-fusion-power-cell (recipe).
I've reached out to the author of Bluetonium Fusion already, but wanted to let you know since since disabling this mod fixes the issue.