Adds additional colors to use in circuit lamps
Mods introducing new content into the game.
Entities which interact with the circuit network.
So AAI uses signal-grey for one of their entities, and your mod replaces signal-grey with signal-light-grey and signal-dark-grey, but removes the original signal-grey. http://i.imgur.com/DCKfSLs.png
Detailed forum post whilst debugging the issue: https://forums.factorio.com/viewtopic.php?f=93&t=38475&start=280#p277551
So at current this mod is not compatible with AAI.
I just had a similar error with the mod when the game loaded up.
