lingo 报错 model is ill defined

题目

lingo 报错 model is ill defined
model:
sets:
warehouses/wh1..wh3/: capacity;
vendors/v1..v8/: demand;
links(warehouses,vendors): cost,volume,x;
endsets
min=@sum(links: cost*volume)-@sum(links|x #eq# 1:0.5*cost*volume);

@for(links: @bin(x));
@sum(links|x #eq# 1: volume)

答案

模型有错,lingo无法求解