Diagnosis
Incorrect assignment between lines and line groups. There are twopossible reasons this:

• The assignment of lines to line groups must be in ascending order, i.e.
as the line number increases, the line group must either stay the sameor also increase.

• The assignment is incomplete, i.e. not all the lines are assigned to a
line group. You must either assign all lines to a line group or none atall.

Procedure
Correct the assignment.