Multi objective optimization with genetic algorithms

Hello, I hope that you are very well.

Please, I am in need to your help, I use the multi objective optimization with genetic algorithms in Matlab and when I do the simulation, the simulation run for a time and stoped and I have the following message:

"Optimization running.

Error running optimization.

The following error occurred converting from cell to double:

Error using double

Conversion to double from cell is not possible."

and the pareto front shows me just one point, I don't knwo the problem, please can you help me on this, I will be very thankfull.