--- a/plcopen/plcopen.py	Fri Oct 13 13:17:42 2017 +0300
+++ b/plcopen/plcopen.py	Mon Oct 16 17:20:31 2017 +0300
@@ -2831,7 +2831,7 @@
         elif opened == closed:
             i += 1
         else:
-            raise ValueError(_("\"%s\" is an invalid value!") % value)
+            raise ValueError(_("\"%s\" is an invalid value!") % values)
     return items