81. NO FEASIBLE SOLUTION FOUND.
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LINGO was unable to find a solution that simultaneously satisfies all the constraints. Here are some suggestions:
| • | Check the model’s consistency. |
| • | Run the Solver|Debug command to have LINGO search for minimal infeasible constraint sets. Note: LINGO may not be able to complete this command in a reasonable amount of time on large and/or difficult models. |
| • | Try dropping constraints until the problem goes away to get an idea of where the trouble may lie. |
| • | Check the solution report. Constraints contributing to the infeasibility will have a nonzero dual price. |