Since an update was recently released, I thought the compatibility issue with More Ammo, which I reported last time, had been resolved, so I reinstalled and started again.
However, this time, it seems like a different error has occurred.

모드 불러오기 실패: Error in assignID: recipe with name 'kr-rifle-magazine' does not exist.

Source: bullet-productivity (technology).

metal-and-stars (0.1.17)
gradual-productivity-research (0.0.1)
OCs_ammo_casting (0.8.1)

Thanks for the bug report. This issue will be resolved with OCs_base_assets (0.3.1), as the problem was rooted there, but only becomes visible in combination with the ammo mod.

Thank you OC1024 :)

Still getting the same error and can't start X)

Of course, I updated to OCs_base_assets (0.3.1)

Hm, that's odd. Can you give me a bit more of the log? I will tackle that tomorrow.

I don't know anything about coding or modding.
I looked for the part containing "kr-rifle-magazine" in the factorio-current.log file.
Here's everything:

47.772 Script @OCs_base_assets/prototypes/utils/helper.lua:147: Added +0.1 kr-rifle-magazine productivity bonus to bullet-productivity
47.772 Script @OCs_base_assets/prototypes/utils/helper.lua:147: Added +0.1 casting-kr-rifle-magazine productivity bonus to bullet-productivity
141.420 Error ModManager.cpp:1764: Error in assignID: recipe with name 'kr-rifle-magazine' does not exist.

That's totally fine and exactly what I've asked for.

I am currently working on a hotfix to your issue. This time, I'll test it before releasing ;)
For the future I hope for a more elegant way, but I also want to enable you to have the joy of the newest version.