I have a problem about defining one of the set in my model.

Sets in the model:

*o sessions /1*4/

*k booklets /1*m/

*i courses /1*87/

*s students /1*30/;

At the beginning of the study, number of booklets (k) is unknown and my aim is to minimize the total number of booklets.

I define the booklet set 1*m, and i get

**767 error**(Could not extract number in <element> * <element> list)

How can i define the booklet set?

Thank you guys.

Emine.