lingo错误 1017

lingo错误 1017
代码：
model:
sets:
level/1..5/:p,z,goal;
variable/1..3/:x;
s_con_num/1..8/:g,dplus,dminus;
s_con(s_con_num,variable):c;
obj(level,s_con_num)/1 1,2 2,2 3,2 4,3 8,4 5,4 6,4 7,5 1/:wplus,wminus;
endsets
data:
ctr=?;
goal=?0;
g=1700 50 50 80 100 120 100 1900;
c=5 8 12 1 0 0 0 1 0 0 0 1 1 0 0 0 1 0 0 0 1 5 8 12;
wplus=0 0 0 0 1 0 0 0 1;
wminus=1 20 18 21 0 20 18 21 0;
enddata
min=@sum(level:p*z);
p(ctr)=1;
@for(level(i)|i#ne#ctr:p(i)=0);
@for(level(i):z(i)=@sum(obj(i,j):wplus(i,j)*dplus(j)+wminus(i,j)*dminus(j)));
@for(s_con_num(i):g(i)=@sum(variable(j):c(i,j)*x(j))+dminus(i)-dplus(i));
@for(level(i)|i #lt# @size(level):@bnd(0,z(i),goal));
End
哪里错误呢?