各位网友，Lingo报错161怎么解决？

请问我这个代码哪里出错了？
model:
sets:
lou/1,2,3/;
jiaoshi/1..10/;
link(lou,jiaoshi):X,S,W,G;
endsets
min=@sum(link(i,j):X(i,j)*W(i,j)2);
@for(jiaoshi(j):
@sum(lou(i):X(i,j))=1;);
@for(lou(i):
@sum(jiaoshi(j):X(i,j))=1;);
@for(link:@bin(x));
@for(jiaoshi(j):
@sum(lou(i):S(i,j)X(i,j))<=900);
@for(jiaoshi(j):
@sum(lou(i):G(i,j))>=1/3S(i,j););
@for(jiaoshi(j):
@sum(lou(i):G(i,j))<=1/2S(i,j););
data:
S=80 90 92 93 88 85 86 80 79 99
90 88 90 80 89 70 80 90 79 88
100 99 80 76 85 78 90 92 94 90;
W=10 10 10 10 10 10 10 10 10 10
10 10 10 10 10 10 10 10 10 10
10 10 10 10 10 10 10 10 10 10;
G=28 33 35 29 30 29 33 34 36 40
43 29 30 35 33 30 35 36 22 20
21 26 30 34 32 23 30 31 32 33;
enddata
end

stack Overflow看看