diff -r f37b88d3edc6 -r 2295fdc5c271 dialogs/ForceVariableDialog.py
--- a/dialogs/ForceVariableDialog.py	Mon Nov 28 16:27:24 2016 +0300
+++ b/dialogs/ForceVariableDialog.py	Mon Nov 28 16:47:01 2016 +0300
@@ -174,7 +174,7 @@
         if value == "":
             message = _("You must type a value!")
         elif GetTypeValue[self.IEC_Type](value) is None:
-            message = _("Invalid value \"%s\" for \"%s\" variable!") % (value, self.IEC_Type)
+            message = _("Invalid value \"{a1}\" for \"{a2}\" variable!").format(a1 = value, a2 = self.IEC_Type)
         if message is not None:
             dialog = wx.MessageDialog(self, message, _("Error"), wx.OK|wx.ICON_ERROR)
             dialog.ShowModal()