Thanks you very much for taking time to explain that to me, that's very nice of you. It's work perfectly fine, annoying warning message is gone. Exact file location is "[Don't Starve Folder]/Data/Scripts/Mods.lua". Many thanks to you Skru_loose.
I know I have mods installed, I click that understand button, stop showing me that message alert game please! I find a post on this forum from 2013 : In scripts/mods.lua go to if #self.mods > 0 then and change it to if #self.mods > 10000 then I can't understand what this mean, where is this "scripts/mods.lua" he is talking about??? What does this numbers mean : 0...10000...??? is this a delay of some sort???