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！！！
我把程序贴在这，
- D/ N% N7 q6 Q$Title A Investment Problem
$ontext
* `: }8 A) N) C8 f6 Qthis problem finds a optimized investment that meets
requirements in the city
0 i4 w4 w- f% f$ Z; i# B1 ]- S$offtext
; J# [8 c1 L  {$ e9 F7 SSets
; K1 Q* |  i/ @9 V5 p; o    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
& W2 T& R9 y8 l, }    c(i)  the unit installed capacity of power plant i in cases
1 M% W5 x+ J4 i/ J3 g. Z/ k) Y       /plant-1  10
8 @! ?, d9 d2 Y8 G5 E        plant-2  7
        plant-3  16
        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
8 `8 g/ ~3 f. N9 p' u  n        mode-2  3
4 ^7 ^7 W. k8 g        mode-3  2/;
Table f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
        plant-1   0.4      0.24     0.04
) F0 g4 G9 h1 a+ x! u* i        plant-2   0.45     0.27     0.045
        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
: z2 y( D7 q$ h: G. EScalar m the minimum total installed capacity of the four power plant /12/
       b the minimum tatal investment budget of the four power plant /120/;
3 W0 V( \$ b3 W8 _7 X5 b( c9 ZVariables
       x(i) the installed capacity of the i power plant in cases
       y(i,j) the operating lever of the i power plant under the j operating mode
* ?* q0 D3 c) J. i3 H       z the total cost of the four power plant;
Positive Variable x;
* r6 Y& d/ _1 o/ m, k1 [Equations
3 m  D# p  ^( r9 i1 s% G) u       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
" Z2 J0 E4 e" R) r       budget(i)      observe total investment budget limit at plant i
  P. C: H1 O: P$ N       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;
! p- k$ A  O: N0 I2 Y8 w9 S1 ]budget(i)..       sum(i,c(i)*x(i)) =l= b;
2 o) C3 k2 t- N5 ]6 Rcapacity2(j)..    sum(j,y(i,j)) =l= x(i);
8 ^% W" c2 v3 P: N( B" I7 odemand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
. S5 {' Q2 V  N, ISolve investment using lp minimizing z;
Display y.l, y.m;

6 k0 T- x* H! x运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！