pyFMOD problem

[Tian]

I am trying to use pyfmod in python to manipulate sound.
i have installed pyfmod, ctype, numarray (if they are necessary), i
also copied fmod.dll to python/DLLs as well as windows/system32, but
when i tried

   import pyFMOD

I got:

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in -toplevel-
    import pyFMOD
  File "C:\Python24\Lib\site-packages\pyFMOD.py", line 177, in
-toplevel-
    _FSOUND_Sample_Load = getattr(fmod, "_FSOUND_Sample_Load at 16")
  File "C:\Python24\Lib\site-packages\ctypes\__init__.py", line 323,
in __getattr__
    func = self._StdcallFuncPtr(name, self)
AttributeError: function '_FSOUND_Sample_Load at 16' not found
-------------------------------------
How can I deal with this?
Thanks!