Modding Help Armor add-on error

I'm tying to make couple additional armor sets as add-ons for already existing mod. For testing purposes I stripped the files of all references to the core mod, in the end using only assets in the same folder or vanilla. And I have no idea what gives, but I keep getting errors on startup. Log attached

 

I get the exact same startup error!

 

The error seems to be complaining that something that was expected to be an array is instead a string. Almost certainly a syntactical error in your mod, but since you haven't shared your mod's code, we can't help any further.

 

Here's the code of the chest armour, I don't know what seems to be wrong with it: