wildstar addon errors

I keep getting addon erorrs in wildstar (which is odd because I haven't installed any addons; it seems the game takes the liberty of calling most of the default features of the game addons anyway).

Here is a sample error:
ui\Costumes\Costumes.lua:375: attempt to index local 'unitPlayer' (a nil value)
stack trace:
ui\Costumes\Costumes.lua:375: in function 'UpdateCostumeSlotIcons'
ui\Costumes\Costumes.lua:501: in function <ui\Costumes\Costumes.lua:497>

What is the problem?

Can't you read? Your costume icon isn't being updated properly.

>>1
Use Lisp.

Lua is subpar. Even Python is better.

Assignment returns nothing in Lua. worthless fucking language