3. Stop chosen when the maximum iteration limit was reached.

This message appears when (i) the Solver has completed the maximum number of iterations, or trial solutions, allowed in the Iterations box in the Solver Options dialog and (ii) you clicked on the Stop button when the Solver displayed the Show Trial Solution dialog. You may increase the value in the Iterations box (to a maximum of 32767) or click on Continue instead of Stop in the Show Trial Solution dialog. But you should also consider whether re-scaling your model or adding constraints might reduce the total number of iterations required.