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！！！
/ D/ R$ I$ B$ l. V& q# Q6 i; q8 f我把程序贴在这，
$Title A Investment Problem
$ontext
* @- H- v- {4 m; F+ Z! dthis problem finds a optimized investment that meets
" M; e( r0 L' v& I4 U- _, B* yrequirements in the city
$offtext
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
9 U8 J) x# u8 E& g; F' F" ~: e       /plant-1  10
$ O% K5 E: l8 I9 A. Q        plant-2  7
        plant-3  16
        plant-4  6/
$ s0 V2 \! y5 X7 x+ {* T( ~# s4 C    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
        mode-2  3
6 N$ c, e7 R' }+ x$ @# E" n+ R0 }        mode-3  2/;
) x, w, g( U% o, iTable f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
# B" |2 O( Q1 N/ R1 y        plant-1   0.4      0.24     0.04
        plant-2   0.45     0.27     0.045
* j; }3 E# X( g6 J) j6 S        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
3 C! \7 y# l3 y1 P. \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/;
1 |: \# I5 Z- t6 M, yVariables
       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;
5 x& r: ~3 a4 S6 W& SEquations
       cost           define objective function
2 R0 A  p$ K  \0 @( a# D' j       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;
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);
$ {: o0 X4 p8 ^2 g6 X" v+ IModel investment /all/;
Solve investment using lp minimizing z;
5 k9 z4 h- F0 v1 X2 ?3 YDisplay 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！！！