Nil Value Error

So i dont know if luacore was updated today or something but i just logged in just a moment ago and now all my luacore addons will not work and they all give me this same error

Lua--C:\Program Files (x86)\Windower4/addons/libs/xml.lua:273: attempt to perform arithmetic on field "isempty" (a nil value)

i have tried to deleting and redownloading all the addons but nothing.

any suggestions?

It's not an addon, it's the /libs folder. Get the new one from here.

Yes i just fixed it using my wife's lib folder. Thank you though. good to know that i can download the new one from there