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！！！
6 C$ S* q9 x' ~( D& i& e: g我把程序贴在这，
$Title A Investment Problem
- k' ]7 q/ b) f  X0 l) u* c$ontext
$ _2 a/ f0 y& `) rthis problem finds a optimized investment that meets
/ f8 [. ~1 T- Z( jrequirements in the city
. {: R; p8 K' e' j2 J4 I3 m$offtext
Sets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
# h$ y5 h, R% T3 U( O    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
) E+ Q8 x2 W0 R" R    c(i)  the unit installed capacity of power plant i in cases
: o, l; ~4 a2 D       /plant-1  10
9 M( t% d' u" k8 G        plant-2  7
        plant-3  16
        plant-4  6/
6 l* _) K4 @2 t2 ~# Z    d(j)  the electricity demand for power plant i in cases
8 S' c* q" i- o) n" ?       /mode-1  3
* R# C$ I4 P$ W( J* ?        mode-2  3
: B. O; t% x" J# E$ g# N$ Y        mode-3  2/;
Table f(i,j) the unit operating cost of each power plant
# K' F: r0 l0 k5 [, x8 v$ g                 mode-1   mode-2   mode-3
        plant-1   0.4      0.24     0.04
        plant-2   0.45     0.27     0.045
7 o3 b+ ~. t+ }! g( [0 I6 W        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
" ?7 g/ e: I6 C3 Q  f( w, `Scalar m the minimum total installed capacity of the four power plant /12/
       b the minimum tatal investment budget of the four power plant /120/;
: E6 i  O  v1 [- P9 w0 ?Variables
2 u( W: M5 ^! \# h% i       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
7 z2 U* l! B& K6 L: Q       z the total cost of the four power plant;
; ~& F& W& k0 p' V/ m' \Positive Variable x;
: }$ }6 }; H4 x5 aEquations
       cost           define objective function
3 V3 a$ G$ [& x, Q( W) K% q6 F       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
% \! m( B7 m3 H       demand(i)      satisfy the electricity demand under each operating mode;
  b2 }. f1 V3 Mcost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
6 g! K0 i! `: ~. fcapacity1(i)..    sum(i,x(i)) =g= m;
0 `. t" v2 }; Y! A7 r- r% H! Dbudget(i)..       sum(i,c(i)*x(i)) =l= b;
capacity2(j)..    sum(j,y(i,j)) =l= x(i);
- K- B$ |) |/ V* `  Pdemand(i)..       sum(i,y(i,j)) =g= d(j);
1 g1 z2 n) U' }- n$ x: ^Model investment /all/;
* f# g* ^3 y$ C/ d+ V. RSolve 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！！！