I get the following error when I try to run Production Scrap together with AAI Industry:
Failed to load mods: Error while loading recipe prototype "stone-furnace" (recipe): Key "icon" not found in property tree at ROOT.recipe.stone-furnace
Modification: Base mod > AAI Industry > Production Scrap 2

Active are only the mods:
base
aai-industry
boblibrary
ProductionScrap2

Additional info provided by Earendel: the error might occure because AAI Industry has a normal and expensive version and a new recipe spec concerning irons that was added a while ago.