我用MPLUS在做一个多群组同一模型路径系数的检验时候出现了这样一个问题，BY语句的变量无法定义，请大家看看代码错在哪里？
  DATA: FILE IS fenge.dat;
  VARIABLE: NAMES ARE m1-m4 x1-x3 y1-y3 z1-z3 l1-l3 j1-j5 k1-k5 g;
            GROUPING IS g (1 = male 0 = female);
  Analysis: bootstrap=1000;
  MODEL male:
  CM by m1-m3;
  EX1 by x1-x3;
  EX2 by y1-y3;
  EX3 by l1-l3;
  EX by EX1-EX3;
  CA by j2-j4;
  EA by k2-k5;
  EA on CA(a1)
        EX(b1)
        CM(c1);
  CA on
        EX(d1)
        CM(e1);
  EX on CM(f1);
  MODEL female:
  CM by m1-m3;
  EX1 by x1-x3;
  EX2 by y1-y3;
  EX3 by l1-l3;
  EX by EX1-EX3;
  CA by j2-j4;
  EA by k2-k5;
  EA on CA(a2)
       EX(b2)
       CM(c2);
  CA on
        EX(d2)
        CM(e2);
  EX on CM(f2);
  MODEL CONSTRAINT:
  new (H1,H2,H3,H4,H5,H6);
  H1=a1-a2;
  H2=b1-b2;
  H3=c1-c2;
  H4=d1-d2;
  H6=e1-e2;
  H7=f1-f2;
  OUTPUT:
  cinterval (bcbootstrap);