data collection in automated indicator based on script

[AndersBGS]

Hi all, 

Currently trying to create an automated indicator which is based on a database view where incidents, problems and outages are clubbed together. Based on this database view, I would like to collect daily summarized outage duration. 

my script I have created is as follow:

var diff=function(x,y){return y.dateNumericValue() - x.dateNumericValue();};
var hours=function(x,y){return diff(x,y)/(60*60*1000);};
hours(current.Outage.Begin, current.Outage.End);

But I get below error in the pa job collector:

From list view of the database view, this is how the refence is:

Outage.Begin and Outage.end is OOTB fields with no changes. 

Anybody that can guide me in the right direction?

Best regards

Anders