ERROR # 1812 - Size Optimization

Hello Everybody,

 

I have problem form Size Optimization about

 

 *** ERROR # 1812 ***
 Multiple responses are assigned to the DESOBJ objective function.
 A MINMAX/MAXMIN objective function definition with DOBJREF should
 be used instead.
 Number of responses = 4

 

How should I do for rerun this problem.

 

Thank you