What are your current mod settings? What other mods are you running? It looks like it found something it wasn't expecting in the peak/floor settings, or some kind of fuel with a custom value unit.
Fuel values have to be converted into Joules by removing the "MJ", "GJ" etc. suffix and multiplying them. The error says there were still letters left after removing the standard units.
Anyway, I'll add a failsafe to skip fuels where this is the case. :)
