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
$ontext
this problem finds a optimized investment that meets
: n7 |$ I$ v1 M. R$ E0 q1 r) [7 u6 ]requirements in the city
, r, c, L- h( U, l1 p) C+ P/ t$offtext
  y% [$ U+ u/ d! z% ?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
7 O% ^0 |4 ~8 r3 O6 v       /plant-1  10
        plant-2  7
        plant-3  16
        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
" E3 h) n# G1 [/ F       /mode-1  3
        mode-2  3
        mode-3  2/;
" r: r  M! @7 ?6 BTable f(i,j) the unit operating cost of each power plant
                 mode-1   mode-2   mode-3
0 g. a' f. Y1 l* @& ]        plant-1   0.4      0.24     0.04
        plant-2   0.45     0.27     0.045
9 Q' K$ b# i8 k) W3 `/ i        plant-3   0.32     0.192    0.032
        plant-4   0.55     0.33     0.055;
Scalar m the minimum total installed capacity of the four power plant /12/
& `/ u. z1 Y0 z$ x, l' z, D       b the minimum tatal investment budget of the four power plant /120/;
  F6 x) D4 }6 [/ ?$ @! z# rVariables
       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;
Equations
       cost           define objective function
       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));
2 R4 m+ q, ~: |1 o* \# ycapacity1(i)..    sum(i,x(i)) =g= m;
3 X9 j9 t: |  f9 }. S' ]! p, Q8 dbudget(i)..       sum(i,c(i)*x(i)) =l= b;
  a8 d0 o3 u+ r# Bcapacity2(j)..    sum(j,y(i,j)) =l= x(i);
) g1 W; S0 x7 ?; c4 ]# ?demand(i)..       sum(i,y(i,j)) =g= d(j);
/ t2 W7 N0 l6 P# ~# bModel investment /all/;
Solve investment using lp minimizing z;
5 A6 O: b' d* t3 m. H! ^Display y.l, y.m;
( h3 Z' M% _1 k* x& e, H1 }
运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！