Change. Use only require to load function.

Fix. Remove multiple definition of same function.

resources/install/scripts/confirm.lua

@@ -26,10 +26,7 @@
 	digit_timeout = "5000";
 
 --check if a file exists
-	function file_exists(name)
-		local f=io.open(name,"r")
-		if f~=nil then io.close(f) return true else return false end
-	end
+	require "resources.functions.file_exists"
 
 --run if the session is ready
 	if ( session:ready() ) then