关于GAMS的问题，小弟询问咯？？请大侠释义…………

随墨枫飞

非常感谢亲！！请各位一定帮帮忙！！学期作业啊！！！
5 d8 z5 o" p7 I" v" ^我把程序贴在这，
$Title A Investment Problem
$ontext
/ j  i) D" p- @: zthis problem finds a optimized investment that meets
& ?7 c5 J6 l, F& orequirements in the city
$ d/ X/ X2 h/ r6 u$offtext
. n/ L& E0 ?" F) ZSets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
    c(i)  the unit installed capacity of power plant i in cases
+ @  {* m) o7 d  Y' j6 X* s9 P- [       /plant-1  10
/ V% @; [6 _, D) X3 f  o% c        plant-2  7
        plant-3  16
        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
6 o& }- a- s/ x1 F+ [        mode-2  3
0 ~+ X+ _8 D4 H/ P8 r        mode-3  2/;
% \" l4 P' K( t1 I9 a+ @9 ~; dTable f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
; Z/ ~  c& Q/ D0 x0 C        plant-1   0.4      0.24     0.04
        plant-2   0.45     0.27     0.045
: z9 p8 R8 q- k/ f3 X6 o        plant-3   0.32     0.192    0.032
$ ^! k& |* S% c6 b2 s9 a8 j        plant-4   0.55     0.33     0.055;
Scalar m the minimum total installed capacity of the four power plant /12/
0 Q1 X% r1 |& W# z7 s       b the minimum tatal investment budget of the four power plant /120/;
) n% M3 g( D3 T! h- F. KVariables
' v1 P. S4 S2 |       x(i) the installed capacity of the i power plant in cases
+ {. w) c5 k) ~( r+ _       y(i,j) the operating lever of the i power plant under the j operating mode
       z the total cost of the four power plant;
Positive Variable x;
4 J) b& d) g5 y+ y0 ], F. BEquations
       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
       budget(i)      observe total investment budget limit at plant i
       capacity2(i)   observe installed capacity for each power plant
       demand(i)      satisfy the electricity demand under each operating mode;
cost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
capacity1(i)..    sum(i,x(i)) =g= m;
budget(i)..       sum(i,c(i)*x(i)) =l= b;
capacity2(j)..    sum(j,y(i,j)) =l= x(i);
demand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
Solve investment using lp minimizing z;
& s' D9 S1 y" z6 [7 O. {3 z. `Display y.l, y.m;

运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！