So it seems when I have the 2.1.0 version going with 1.7.10's NEI 1.0.5.120-universal I get this log and it crashes. Removing NEI is not an option as some of the other mods in the pack require it.

https://paste.ee/p/EBH9b

Use UniMixins.

If nothing else, I'll close this.
I'd also pinned this for it's a common question asked by players.