The Ex Nihilo to Agricraft seed recipes are corrupt in AgriCraft-1.7.10-1.4.0-beta-2-1.7.10. The recipes work as normal in AgriCraft-1.7.10-1.4.0-beta-1-1.7.10.

Affected seed recipes:
Sugar Cane
Cactus
Potato
Carrot

Hardcore Ender Expansion is also complaining about this one. :/

This occurs in the lastest source on git as well (I built it to test.)

I'll have a look at this right now.