谁用过lingo10啊，帮忙看看程序那儿错了

错误是提示语法错误如下：
程序如下
Title Location Problem
sets:
demand/1..6/:a,b,d;
supply/1..2/:x,y,e;
link(demand,supply):c;
endsets

data:
a=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.25;
d=3,5,4,7,6,11;
e=20,20;
enddata

init:
x,y=5,1,2,7;
endinit

[obj]min=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
@for(demand(i):[DEMAND_CON] @sum(supply(j):c(i,j))= d(i););
@for(supply(i):[SUPPLY_CON] @sum(demand(j):c(j,i)) <=e(i););
@for(supply:@free(x);@free(y););
end
附：运行一些简单的程序如下，就没问题
max=72*x+64*y;
x+y<50;
12*x+8*y<480;
3*x<100;

model:
Title Location Problem;
sets:
demand/1..6/:a,b,d;
supply/1..2/:x,y,e;
link(demand,supply):c;
endsets

data:
a=1.25,8.75,0.5,5.75,3,7.25;
b=1.25,0.75,4.75,5,6.5,7.25;
d=3,5,4,7,6,11;
e=20,20;
enddata

init:
x,y=5,1,2,7;
endinit

[obj]min=@sum(link(i,j):c(i,j)*((x(j)-a(i))^2+(y(j)-b(i))^2)^(1/2));
@for(demand(i):[DEMAND_CON] @sum(supply(j):c(i,j))= d(i););
@for(supply(i):[SUPPLY_CON] @sum(demand(j):c(j,i)) <=e(i););
@for(supply:@free(x);@free(y););
end

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