Diagnosis
There is no more space between a screen element that would have fallenwithin the box and the right-hand edge of teh screen. The system cannottherefore draw the right-hand edge of the box.

System Response
The screen element cannot be converted into a box.

Procedure
Enlarge the screen by at least one column or move the screen elementand all other elements that you want to include in the box so thatthere is at least one free column at the right-hand edge of the screen.