How to fix: "Command "generate X X > Y Y Y" interrupted with error: KeyError : '1'

This error is typically linked to a problem with the UFO model where some coupling are not linked to an expansion order (like QED, QCD,...).

To fix this, you need to go back to FeynRules and fix the problem in your .fr file:
Please look at the FeynRules manual Sec. 6.1.7, p. 84.
http://arxiv.org/abs/arXiv:1310.1921