Texure Issue.

I recently installed Miirgui UI retexture,I'm kinda trying to make an UI with minimal add on usage,problem is I get this result: http://imgur.com/gallery/qZicM

I suspect it has something to do with an add on that came with it Here is the print of the lua error:

Message: Interface\AddOns\miirGui\functions.lua:90: attempt to index local 'obj' (a nil value) Time: 06/17/17 12:39:41 Count: 1 Stack: Interface\AddOns\miirGui\functions.lua:90: in function `SetFont' Interface\AddOns\miirGui\functions.lua:137: in function <Interface\AddOns\miirGui\functions.lua:1>

Locals: obj = nil optSize = nil (*temporary) = true (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = nil (*temporary) = "attempt to index local 'obj' (a nil value)"

Sadly however I'm not a developer so I don't know whats going on there. Any help is appreciated.Thank you.