APEX

I created a tabular form (based on a single table) with the primary key being populated by a trigger.

I am able to UPDATE rows in the tabular form and DELETE rows, however, when I click on the "Add Rows" icon, I get the following error: Error in add row internal routine: ORA-01476: divisor is equal to zero.

I have blown tried creating this tabular form several times and each time I get the same error. Do you have any ideas why this is happening?