Problem with the connection between Aspen Plus and Simulink

Good morning,

I'm trying to minimize the error between an Aspen plus simulation and experimantal data using the solver fmincon. After some iterations it gives me this message:

Initial point is a local minimum that satisfies the constraints.

Optimization completed because at the initial point, the objective function is non-decreasing 
in feasible directions to within the value of the optimality tolerance, and 
constraints are satisfied to within the value of the constraint tolerance.

<stopping criteria details>

The x-vector (initial point) is composed of some Aspen variables, but fmincon only receives as input double type data not interfaces, so I had to covert them to double type.

Most probably is because I'm returning a constant value to fmincon from the objective function independent of the x-vector the solver supplies.

How can I fix this?

Thanks in advance

[Daniel Trias]

Hi Riccardo!

Were you able to fix this? I'm having a similar stuation when using some external simulation software to compute the objective function.

Thanks in advance,

Dani