下面是代码，求大佬帮忙看看为啥会这样，感谢！！
TITLE:fumuEFyucEF
  DATA:FILE IS C:\Users\LI\Desktop\Mplus4.dat;
  VARIABLE:NAMES ARE fefzong mefzong cefzong sex Mage5;
  Usevariables=fefzong mefzong cefzong sex Mage5;
  Missing=all(999);

grouping =sex(1=BOY 2=GIRL);

  ANALYSIS:
  ESTIMATOR=MLR;


  MODEL:
  cefzong ON mefzong sex;
  cefzong ON fefzong;
  mefzong ON Mage5;

MODEL BOY:
cefzong ON mefzong(1)
            fefzong(2)
            sex;
mefzong on mage5;

MODEL GIRL:
cefzong on mefzong(1)
           fefzong(2)
           sex;
mefzong on mage5;

  output:samp stand mod(all)cinterval;