Problems in using the Dicopt solver on GAMS

[Tiago Sousa]

Hi guys,

I have a problem in a case study. I'm using a MINLP formulation on
gams and using the dicopt solver to obtain the solution.

The report says that found a Integer Solution, but in the resport says
this:

--- DICOPT: Unexpected objective in MIP

The MIP solution became better after adding integer cuts.
Something is wrong. Please check if your model is properly
scaled. Also check your big M formulations -- the value
of M should be relatively small.

This error can also occur if you used a MIP solver option
file with a nonzero OPTCR or OPTCA setting. In that case
you may want to increase the EPSMIP setting using a
DICOPT option file.


--- DICOPT: Stopped prematurely because of Solver Failure

DICOPT terminated prematurely because of a solver
failure. The listing file will contain additional
logs from the NLP and MIP solvers which may reveal
what was the cause of the failure.

An appears a lot of NOPT points in the constraints. But i'm using the
OPTCR and OPTCA equal to zero, and it indicates that this happen
because these two values are nonzero.

Anyone know how to solve this problem?

Regards,

Tiago Sousa