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，
4 B- r/ q) _8 s$Title A Investment Problem
$ontext
: w' s4 C+ `1 v2 X4 \4 g0 L( zthis problem finds a optimized investment that meets
8 v# l4 l7 ?; N8 H* |. h5 prequirements in the city
% a% `5 z3 f8 D$ i2 [+ l1 R$offtext
- f# F! M7 P# ?5 F) A6 }Sets
    i  power plants  /plant-1, plant-2, plant-3, plant-4/
    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
        plant-2  7
        plant-3  16
6 v* G* F: [: k$ S/ e5 ?0 ?9 `. H        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
4 c- V7 ~7 U5 z2 H8 x  |( m1 L       /mode-1  3
        mode-2  3
        mode-3  2/;
6 z. E; P8 Q) ^) Q4 y1 m& W/ v; F) T- G% ITable 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
2 l; w1 \: Q0 ~+ K        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
" K. Q* o0 u; Z% S5 G( nScalar 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
' u0 f+ l. F, u" E8 E, G       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;
9 o) v  R. F& S: t. y8 F; z; N! ~Positive Variable x;
Equations
( d5 {5 ?- N! ?  J       cost           define objective function
       capacity1(i)   observe total capacity linmit at plant i
9 w9 ?+ k" r$ @6 L* I2 \       budget(i)      observe total investment budget limit at plant i
- S7 q" P- I) J! }       capacity2(i)   observe installed capacity for each power plant
6 d9 @, k* Q; {) q1 O+ ?. R       demand(i)      satisfy the electricity demand under each operating mode;
( c) G% L% l$ v' v  g8 i6 [cost..            z =e= sum(i,c(i)*x(i))+sum((i,j),f(i,j)*y(i,j));
7 T+ T6 a1 X$ u$ R/ Fcapacity1(i)..    sum(i,x(i)) =g= m;
budget(i)..       sum(i,c(i)*x(i)) =l= b;
capacity2(j)..    sum(j,y(i,j)) =l= x(i);
demand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
% V7 ~* y$ n! B. PSolve investment using lp minimizing z;
7 h2 a( n% V5 F( U: LDisplay y.l, y.m;
  |/ O2 Z/ D: m5 e4 w
( P  T$ }: v2 E0 r+ I9 E+ w6 ~- f运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！