Thanks for your report. TL;DR this should be fixed in the new version (0.1.4)
While I wasn't able to reproduce directly, it appears that for some reason the "rifle-magazine" recipe in your Krastorio 2 is not present. It worked for me and I do have that recipe. I was able to reproduce a similar error by misspelling that recipe to "fake" it missing.
To fix it, what I've done is added an extra layer of input validation to handle cases like this, so it should load now. However, I'm not sure why it failed for you in the first place, or why it seems like that recipe is missing.