** Infeasible solution. Convergence too slow. The change in objective
has been less than 1.1931E-08 for 20 consecutive iterations.

** Warning **  The variance of the derivatives in the final
                point is large (= 4.2 ). A better scaling or
                better bounds on the variables will probably
                help the optimization.


用GAMS做的，出现了以上问题，请问哪位大侠会此类问题，报酬可商量