Got an this error message when starting the game:

Error loading mods
Failed to load mods: Error while running setup for entity prototype "burner-assembling-machine" (assembling-machine): When next_upgrade is set entity mining result must not contain item product with "hidden" flag set. Mining results with no item products are allowed.

Mods to be disabled:
- lignumis (1.0.57)
- atan-ash (2.2.1)

Don't know if the error is caused by your mod or atan-ash.
I'm playing with "Exotic Space Age Remembrance" mod enabled and the ash mod it a dependency for it.
Is that fixable?

Was atan-ash added recently? I'm not sure if it's really that mod as I don't see any code that does it (I only had a quick look).

I currently don't support "Exotic Space Age: Remembrance" because compatibility code is on the other side. Maybe ask there.

Thanks for your reply.
I posted in the forum of Exotic Space Age Remembrance and the author found the error. Everything is fine :)