** Warning **  The variance of the derivatives in the initial
                point is large (= 4.9 ). A better initial
                point, a better scaling, or better bounds on the
                variables will probably help the optimization.


** Infeasible solution. Convergence too slow. The change in objective
    has been less than 7.7168E-11 for 20 consecutive iterations
在做CGE模型过程中，是静态模型，用gams做的，出现这样的问题，请问哪位大侠会此类问题，报酬可以商量。