LINGO软件报错求助！！！高分悬赏！

model:
sets:
        Point: x,y,q;
endsets
data:
x=34.8,24.2,36.4,29,25.4,54,40.6,22.1,25.7,38.6,47.5,25.3,30.5,20.7,39.9,26.3,24.5,49.2,55.5,43.5,21.6,62.9,,;
y=54.6,72.4,66.5,73.7,73.4,52.7,47.3,60.7,60.5,72.5,51.9,67.8,60,76.2,54.4,70.3,65,68.1,61.5,63.1,60,64.4,,;
q=4,6,6,6,6,6,6,6.4,8,8,8,8,10,10,10,10,12,12,12,14,16,28,0,0;
enddata
min=f+g;
f=@sum(Point(I) | (@abs(x(I)-x(23))+@abs(y(I)-y(23))) #le# 21.4 :((@abs(x(I)-x(23))+@abs(y(I)-y(23)))*q(I)*2.253)) ;
g=@sum(Point(I) | (@abs(x(I)-x(24))+@abs(y(I)-y(24))) #le# 21.4 :((@abs(x(I)-x(24))+@abs(y(I)-y(24)))*q(I)*2.253));
x(23)>=0;
x(24)>=0;
y(23)>=0;
y(24)>=0;
end

因为x(23),x(24),y(23),y(24)都是未知变量，当LINGO程序初始化生成模型时，由于生成目标函数f 和g时需要它们已知，所以报错！

模型的定义错误