我在用SPSS做PLS时，怎么出现下面的结果啊？请高手指教。

PLS VAR00001 MLEVEL=S WITH VAR00002 VAR00003 VAR00004 VAR00005
  /CRITERIA LATENTFACTORS=5.

>Error # 6886.  Command name: BEGIN PROGRAM
>The External Program could not be loaded.
>This command not executed.
Load library from D:\Program Files\SPSSInc\SPSS16\invokepython.dll failed.

>Error # 6887.  Command name: BEGIN PROGRAM
>External program failed during initialization.