mplus中心化运行错误

TITLE: this is an example of a big-fish-little-pond-effect
  DATA: FILE = multilevel_SE.dat;
  VARIABLE: NAMES = cntid schid ssid gender ses
                  seff scon score weight sescnt sessch scosch;
            USEV = schid gender ses scon score scosch;
  BETWEEN = scosch;
  CLUSTER = schid;
  MISSING ARE ALL (9999);
  DEFINE: CENTER score  (GRANDMEAN);
  ANALYSIS: TYPE = TWOLEVEL;


大神帮我看一下，运行之后显示
INPUT INSTRUCTIONS

  TITLE: this is an example of a big-fish-little-pond-effect
  DATA: FILE = multilevel_SE.dat;
  VARIABLE: NAMES = cntid schid ssid gender ses
                  seff scon score weight sescnt sessch scosch;
            USEV = schid gender ses scon score scosch;
  BETWEEN = scosch;
  CLUSTER = schid;
  MISSING ARE ALL (9999);
  DEFINE: CENTER score  (GRANDMEAN);
  ANALYSIS: TYPE = TWOLEVEL;


*** ERROR in DEFINE command
  Error in assignment statement for CENTER


我中心化没写错啊

求大神指导

中心化语句好像是
CENTER = GRANDMEAN(SCORE)