Hi,

I am working on a multi objective problem and in every situation the model gave me the ** Infeasible solution. Reduced gradient less than tolerance. error.

Normally the model can solved as a single objective problem ( if I sum up two objective function in a row). But when I try to split the objectives and solve the model as multi objective model it gives infeasible solution error. I tried the fuzzy logic and epsilon constraint methods.

What could be the real problem?