Cause
This error occurs when a collection is attached to a list box, combo box, or table and code attempts to add or remove an entry from the control or to set the
When a collection is associated with a sheet of a control
The
Action
When you attach a collection, you cannot add non-collection entries and you cannot remove existing entries. The value of the itemObject property for an item is the attached collection object, and therefore it cannot be changed. Change your application code accordingly.