Calculate Field tool

[KateEkhator74]

Hello 

Am trying to calculate the percentage area of the land cover classes in my map and keep on getting this error message (see attached). I tried changing the setting when adding the new field (percentage) so that I can click on the allow null, but it is greyed out. I tried clicking on the error message and it tells me there is no solution at this time. 

Please can anyone help?

Thanks.

[DanPatterson]

Do you have any records with null values in that field?

I would add a new field (eg double, Area2, make sure it isn't nullable)

Then try the expression again.

[KateEkhator74]

The percentage field had zeros (0) after I added the field (see attached), made sure data type was double. I can't edit the column for null when adding field. It opens greyed out.

[JayantaPoddar]

Could you delete the comma in the denominator (15675.2), and try again?

[DanPatterson · Accepted solution]

comma could be localization

[KateEkhator74]

Thanks, removed comma and it worked.

[KateEkhator74 · Accepted solution]

This worked, thanks.