INPUT INSTRUCTIONS

  TITLE: 1-1-1random slopes（MSEM）
  DATA: FILE IS 1-1-1.dat;
  VARIABLE: NAMES ARE
    ID Y X M ;
    USEVARIABLES ARE
    ID Y X M ;
    CLUSTER IS ID;
    ANALYSIS:
    TYPE=twolevel random;
    MODEL:
    %WITHIN%
    sa | m ON x;
    sb | y ON m
    sc | y ON x;;
    %BETWEEN%
    sa sb sc x m y;
    sa WITH sc x m y;
    sa WITH sc x m y;
    sb WITH sc x m y;
    sc WITH x m y;
    m ON x(ab);
    y ON m(bb);
    [sa](aw);
    [sb](bw);

    MODEL CONSTRAINT:
    [sb](bw);
    a=aw+ab;
    b=bw+bb;
    indw=aw*bw+cab;
    indb=a*b;

    OUTPUT: TECH1 TECH8 CINTERVAL;

*** ERROR in MODEL command
  Undefined keyword | for random effect definition.


这个错误怎么解决？