Try removing Immersive Engineering or updating it.
The logs you provide show that Immersive Engineering's sawmill recipe type is not recognized, meaning it hasn't been added to the mc recipe_type registry.
This may be a problem with the mod instead, so try updating (or downgrading) it, and worst case, you just remove it entirely.
It would use the language of your choice (Major languages only, and not languages like PHP for god's sake.) and you could automate it, sort of like the agent in MC:EE
There is a very good tool for beginner modders called MCreator. You can make anything from a mod to a plugin with it, and you can upload your mod to their website at mcreator.net/