TITLE:EFA PARALLEL ANALYSIS;

DATA:
  FILE IS 764mplus.dat;

VARIABLE:

   NAMES ARE A1-C9;
  USEVARIABLES = A1-A10 A12 B1-B10 B12-B22 C1-C5 C7-C9;

ANALYSIS:
    TYPE = EFA 3 3;
    PARALLEL = 46;
    ESTIMATOR = MLR;


OUTPUT:STANDARDIZED ;
PLOT: TYPE IS PLOT2;
程序如上
错误如下
*** ERROR
  Variable names must begin with an alphabet character:

*** ERROR in DEFINE command
  A new variable included on the USEVARIABLES list was not defined.
  Check your DEFINE statements.  Undefined variable:  A1

这该怎么解决啊小白一枚