Description of the issue:

I can't open Engineer's Manual. When I try to do it, I get a message (1 entries failed to load! Please report this as an issue with your log file!). And the log says “java.lang.IllegalStateException: Config key ores.copper.min_y does not exist”.
Tested with IE on its own, issue disappeared , it might be a conflict with another mod.

Crashlog:

To be precise, this is part of “latest.log” rather than the crashlog.
(https://gist.github.com/JtheV/4dd62ec3d9e6ea5f4174bf873e3813d7)

Versions & Modlist

Forge version: 39.0.20
IE version: 1.18.1-7.1.0-145

Modlist:
https://gist.github.com/JtheV/d1d3cb525a2fe1fbfb6c816307f1b438

Thanks for help.

Yeah it must be a conflict with another mod.
The first one I would try if I were you is removing Create Crafts & Additions.

If that isn't it, then I'm afraid you'll have to do a binary search:

1. Remove half the mods, see if the issue persists
2. If that fixed it, the issue is in the removed half, if the issue is still there, it's in the remaining half.
3. Keep halving your modlist until you find it.

Yeah it must be a conflict with another mod. The first one I would try if I were you is removing Create Crafts & Additions.

If that isn't it, then I'm afraid you'll have to do a binary search:

1. Remove half the mods, see if the issue persists

2. If that fixed it, the issue is in the removed half, if the issue is still there, it's in the remaining half.

3. Keep halving your modlist until you find it.

Thanks for reply. I'll try it when I'm free.

I've found the problem. I loaded a translation file belonging to an older version by accident.
Thanks for your help. I think you can close this issue.

You could also have closed it yourself, since you're the one who opened it.