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，
$Title A Investment Problem
$ontext
this problem finds a optimized investment that meets
requirements in the city
& w/ f- D5 |  G$offtext
Sets
9 j. O7 ~; f/ z    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
    c(i)  the unit installed capacity of power plant i in cases
. ?! F: |5 {. [+ x: }0 p       /plant-1  10
$ m+ L3 m6 n- c! {/ y        plant-2  7
( Y' P) J( u  ]0 b        plant-3  16
        plant-4  6/
$ o  z. F7 x5 Q* F+ C5 f    d(j)  the electricity demand for power plant i in cases
' L& @- H2 V7 @- O, D& w+ S3 F6 D       /mode-1  3
        mode-2  3
        mode-3  2/;
Table f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
  [9 p8 d% f- P( N        plant-1   0.4      0.24     0.04
        plant-2   0.45     0.27     0.045
  U2 E4 X# f- j6 t; b        plant-3   0.32     0.192    0.032
1 V* J' s$ c/ Y3 l+ u2 D        plant-4   0.55     0.33     0.055;
2 a3 r& u$ {( X% m/ gScalar m the minimum total installed capacity of the four power plant /12/
       b the minimum tatal investment budget of the four power plant /120/;
Variables
' G5 O8 g4 ]& A3 s7 |6 c       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;
# k, {* s, A5 d+ z6 F. Q4 UPositive Variable x;
% A! _/ `8 [/ T, Y: h8 gEquations
4 p" w( E* T5 {% l$ K       cost           define objective function
" H; Y' e5 @+ f" `       capacity1(i)   observe total capacity linmit at plant i
       budget(i)      observe total investment budget limit at plant i
! ?3 L. c; P0 k$ S       capacity2(i)   observe installed capacity for each power plant
: b, |. J4 ]9 J! {& a       demand(i)      satisfy the electricity demand under each operating mode;
/ b0 F1 K+ G/ V* W% `1 ccost..            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;
; F* T$ P7 G. ?0 Z. v4 vbudget(i)..       sum(i,c(i)*x(i)) =l= b;
capacity2(j)..    sum(j,y(i,j)) =l= x(i);
% g( N" G4 l/ e) }8 |% Bdemand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
- A: I3 H/ K* ISolve investment using lp minimizing z;
# R8 n5 ~& V% X: ^# ?& L% BDisplay 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！！！