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，
# Y' A( k5 a- Z/ l( D$Title A Investment Problem
3 p9 i3 h2 W- Q$ c) z$ontext
7 H/ g$ Y' m* ^% d8 W2 Ithis problem finds a optimized investment that meets
requirements in the city
2 |! d( r, q7 G, B- ?$offtext
Sets
  _/ P" F' @6 \! u5 w  G) U    i  power plants  /plant-1, plant-2, plant-3, plant-4/
' |1 @2 m) e6 L    j  operating mode  /mode-1, mode-2, mode-3/;
Parameters
: X- h  s7 l8 l  F) a: x    c(i)  the unit installed capacity of power plant i in cases
       /plant-1  10
        plant-2  7
        plant-3  16
        plant-4  6/
    d(j)  the electricity demand for power plant i in cases
       /mode-1  3
        mode-2  3
        mode-3  2/;
Table f(i,j) the unit operating cost of each power plant
# r' y1 E' R' t4 _                 mode-1   mode-2   mode-3
, a. X  e" r/ [$ ?; ]4 M        plant-1   0.4      0.24     0.04
8 A4 w, P% w6 b: p+ m. c        plant-2   0.45     0.27     0.045
" C: R/ k5 z* y+ J        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/
; O, O. [; c- o$ J( w; J* D       b the minimum tatal investment budget of the four power plant /120/;
Variables
# ?/ k  A5 n. E1 l3 U" E! \+ e       x(i) the installed capacity of the i power plant in cases
& q) @: b5 ?5 `2 X7 q: W       y(i,j) the operating lever of the i power plant under the j operating mode
3 |- v9 f! F& Y5 i1 `5 ^) z       z the total cost of the four power plant;
+ H+ `1 M2 X# @% x" ~5 xPositive Variable x;
Equations
       cost           define objective function
* S$ [& h" j; G% w       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
! ?1 z, Y9 L! u6 l+ K( A: M; D       demand(i)      satisfy the electricity demand under each operating mode;
/ m4 N* j9 L- m1 q) zcost..            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;
& u! N1 d# ?* ~0 c5 Abudget(i)..       sum(i,c(i)*x(i)) =l= b;
2 N3 I' ?( a8 T" W+ H; Qcapacity2(j)..    sum(j,y(i,j)) =l= x(i);
demand(i)..       sum(i,y(i,j)) =g= d(j);
Model investment /all/;
& u+ O& Z3 u) l3 c: K1 |1 L) HSolve investment using lp minimizing z;
; s# O2 j; D) u; [Display y.l, y.m;
& u% |& T% |9 ]: q( R3 j
运行出错的，但是不知道怎么解决，请亲给处理一下哦！！！