A problem on testing COM object with VBA

[applejump]

Hi all,
I'm a Python beginner and trying to run the codes from Chapter 5 of Python pramming on win32. But when I tested the COM object with VBA, I got an error msg saying runtime error 438. Is there anyone can help me out? Thanks in advance!

Here are the codes:
[Python]
class PythonUtilities :
_public_methods _ = [ 'SplitString' ]
_reg_progid_ = "PythonDemos.Ut ilities"
_reg_clsid_ = "{D81903FB-62F2-4FB1-993E-63CAF4C963A0}"

def SplitString(sel f, val, item=None):
import string
if item != Nome: item = str(item)
return string.split(st r(val), item)

if __name__=='__ma in__':
print "Registerin g COM server..."
import win32com.server .register
win32com.server .register.UseCo mmandLine(Pytho nUtilities)

After running above scripts, the PythonWin interactive window displayed
Registering COM server...
Registered: PythonDemos.Uti lities

[VBA]
Sub TestPython()

Set PythonUtils = CreateObject("P ythonDemos.Util ities")
response = PythonUtils.Spl itString("Hello from VB")
For Each Item In response
MsgBox Item
Next

End Sub

The code stopped at "response = PythonUtils.Spl itString("Hello from VB")".