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，
" ~6 g1 h9 O9 D; f) ~9 [( W4 d$Title A Investment Problem
$ontext
this problem finds a optimized investment that meets
requirements in the city
$offtext
; }. [8 a1 H  l9 y% V6 @) D& u7 W2 [Sets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
5 q5 F) V2 N1 F9 \    j  operating mode  /mode-1, mode-2, mode-3/;
2 T" b" b. g* J2 l8 g  R0 Z+ E- W$ CParameters
    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
        plant-2  7
9 \" l# V3 x% M5 q1 x9 X1 o' B        plant-3  16
: _) h/ B) D8 d8 K! g, R/ B4 F        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
; `/ S: T0 ~- V$ Q, ?1 D       /mode-1  3
        mode-2  3
: }2 f) h# t, O/ d8 X# I0 N5 v        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
/ H% P) R/ O' |- F3 R& G! c        plant-2   0.45     0.27     0.045
' _! z7 G1 ^1 t! s" Z        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
Scalar m the minimum total installed capacity of the four power plant /12/
& V5 X( C- c6 H       b the minimum tatal investment budget of the four power plant /120/;
& D! p1 Z6 u" P9 ]( Y9 B( X* RVariables
       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
       z the total cost of the four power plant;
; P1 l7 ^/ N! w. [$ C1 K+ ^Positive Variable x;
9 H# @; n" a0 \4 b) E$ \Equations
       cost           define objective function
* X7 M0 ~- U' L; _% S       capacity1(i)   observe total capacity linmit at plant i
       budget(i)      observe total investment budget limit at plant i
3 }; c2 F! ~+ ]3 O' H       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;
7 l: i6 a  ]! K$ tbudget(i)..       sum(i,c(i)*x(i)) =l= b;
capacity2(j)..    sum(j,y(i,j)) =l= x(i);
2 J! b, l" G0 e8 j" b! y7 hdemand(i)..       sum(i,y(i,j)) =g= d(j);
2 Q, K7 P9 T/ k5 ~% s. _Model investment /all/;
8 t1 f7 B4 M, ^. MSolve investment using lp minimizing z;
Display y.l, y.m;
) [$ ^# Z* T6 c0 Y
运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！