Home / Topic / Variables-Confirmation Variables-Confirmation Search for: Home Kwiksher Forums Help me! Variables-Confirmation Viewing 1 post (of 1 total) JorgeParticipant December 10, 2014 at 5:57 pm #83258 Just to confirm. When we set a value to a variable (Edit Variable) should we write: variablename +1 or variablename+1 I believe the former is the right one. I have got the following message on the idap “Runtime error page20.lua:415 attempt to perform arithmetic on field variablename (a nill value)”, which I believe is coming from variablename+1 based on the information the lua line . If this is true, the error seems not to happen all the times! Author Posts Viewing 1 post (of 1 total) The forum ‘Help me!’ is closed to new topics and replies.