So I just updated to the latest version, and now when I try to load the game I get an error loading mods. The message it gives me is:

Failed to load mods: Error while loading recipe prototype "rf-temperate-1" (recipe): Difficulty normal: Expected 2 values or values 'name' and 'amount' but got: 1 values. in property tree at ROOT.recipe.rf-temperate-1.ingredients[0]
Modifications: Reverse Factory

The only thing that changed was the updated version of Reverse Factory, everything else stayed the same.

Hmmm, is this just with mostly vanilla, or do you have some other big mods, like bobs, angels, pycoal, etc? I'm basically wondering what "temperate-1" is... something from Bio Industries?

I do have angels and bobs installed

I have the same error it appears to be from angels bio processing.

Should be fixed as of v5.1.7

Yep, no more issues, thanks for the quick fix :)