[gradsusr] error show EOF processing

[Mxing LI]

hi, all
I downloaded the EOF package (http://www.atmos.ucla.edu/~munnich/Grads/EOF/),
after configured enviroment variables, run eof u in GrADS command line. some
errors show as following, who can tell me what is wrong. please!

Writing data to transfer file...
      Executing eofudf binary ...

Syntax Error:  Invalid Operand
  'eofudf' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = eofudf(sm,696,12,-1,70,sm_)
   eof.gs: First call of eofudf returned Error. STOP
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