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！！！
4 S" _  A6 x! [& D  h+ U5 c我把程序贴在这，
$Title A Investment Problem
( I1 E; A7 [$ e1 ~- ^$ontext
- v1 }3 }% q( s% A& m/ pthis problem finds a optimized investment that meets
requirements in the city
$offtext
5 l4 ~: d! a+ X& C" i6 N$ SSets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
6 [' ~# S7 r! l3 ^: G    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
" w; o  S3 O/ r' j) Z; I        plant-2  7
. T0 `9 h( `2 J; Y  |; V' `        plant-3  16
3 S, u; a& J( i/ l7 ~+ X, B* F3 A. X9 q/ B        plant-4  6/
/ J- Y- q; A* o    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
+ k$ I: ^# d7 M. F        mode-2  3
3 s4 V) e- h7 R        mode-3  2/;
  |; U- B* s$ b. H& _$ _  C4 @/ UTable 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
        plant-2   0.45     0.27     0.045
        plant-3   0.32     0.192    0.032
" F- }, @! V+ ]6 g/ v        plant-4   0.55     0.33     0.055;
Scalar m the minimum total installed capacity of the four power plant /12/
3 E4 ~+ Y7 ]+ z/ h( R       b the minimum tatal investment budget of the four power plant /120/;
& g/ ~( P- U; T2 yVariables
5 h9 Q' J& C1 c: F4 y; U  B* J       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;
Positive Variable x;
Equations
7 ]* l( z7 V1 n+ [$ G       cost           define objective function
8 m: k! T5 k# X! e       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;
9 m! a) V' L& wbudget(i)..       sum(i,c(i)*x(i)) =l= b;
/ X$ N$ ?, u& W7 v( lcapacity2(j)..    sum(j,y(i,j)) =l= x(i);
; g, G) y- s, ]6 u$ _demand(i)..       sum(i,y(i,j)) =g= d(j);
4 Y5 l2 k- @0 q7 G- z- |! R2 |3 hModel investment /all/;
7 V1 O3 H. f( K( J" {5 PSolve investment using lp minimizing 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！！！