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！！！
! p5 E& F' f% `1 ~1 \/ x$ c# }我把程序贴在这，
$Title A Investment Problem
2 O- P# n7 |* u# T: ?$ontext
this problem finds a optimized investment that meets
. W& z- x  o% h  @5 k# C! Vrequirements in the city
$offtext
$ b0 `4 j0 |. c) a7 H: jSets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
+ s, Y0 `8 f2 f" X# C1 v' ]    j  operating mode  /mode-1, mode-2, mode-3/;
8 e4 T$ M5 }2 n0 ~. z) yParameters
8 r" t* s+ |' @) y& D    c(i)  the unit installed capacity of power plant i in cases
/ a6 a0 Q6 Z) y! d, C) m       /plant-1  10
0 x9 P6 o6 I. k, z0 n9 e( s$ i        plant-2  7
        plant-3  16
# C' K# ~& Q# d- }& p- G7 S5 ~2 }        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
        mode-2  3
$ V$ n: }2 ?# ^  B; U        mode-3  2/;
7 t0 o7 b+ B9 h% z8 ATable 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
5 n4 w6 s- m3 K6 S        plant-3   0.32     0.192    0.032
: n9 R" a* x5 Y        plant-4   0.55     0.33     0.055;
5 N/ H4 g$ s2 i* C" U0 IScalar m the minimum total installed capacity of the four power plant /12/
# }( \: Q. b  U3 T' ?       b the minimum tatal investment budget of the four power plant /120/;
Variables
       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;
3 E$ I+ \/ Z3 F7 D  C2 IEquations
, s8 c) O2 a, ]- L5 _( }1 O       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
8 P+ R4 \0 w7 N" b* Q' g       budget(i)      observe total investment budget limit at plant i
       capacity2(i)   observe installed capacity for each power plant
: X7 L. _2 E* H! M$ }/ e       demand(i)      satisfy the electricity demand under each operating mode;
$ _( A2 y- `1 s$ Z- Ecost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
: F( [5 B  b4 S4 O% c! o6 C( Pcapacity1(i)..    sum(i,x(i)) =g= m;
& H3 t9 A7 u) o& e2 fbudget(i)..       sum(i,c(i)*x(i)) =l= b;
* ^( B0 E) a7 W: I- T) scapacity2(j)..    sum(j,y(i,j)) =l= x(i);
demand(i)..       sum(i,y(i,j)) =g= d(j);
3 k6 D1 L. h6 ~; OModel investment /all/;
+ `! N9 C$ Y" n8 Z+ @0 ]Solve investment using lp minimizing z;
" V& Z  |. f. I, k8 N  ]Display y.l, y.m;
+ N2 o, t# x' X0 m  W
& @- G# o) y  a运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！