I try to run an optimization Problem which contain 6 include files , if i run it with the option (OptiStruct >> MERGE INCLUDES ) there are no problem, if i want to run it with ( OptiStruct >> PRESERVE INCLUDLES ) i got this error ' *** ERROR # 583 *** Missing objective, DESGLB and DESSUB data must be used together with an objective function defined by DESOBJ, MINMAX, or MAXMIN. ' !!
Can someone please can explain this error and how can i solve it ?