AttributeError: 'NoneType' object has no attribute 'get_text'

[Raji Seetharaman]

Hi all, i worked out python and glade example program to add two numbers and
display its output from the following link
http://www.dreamincode.net/forums/showtopic63885.htm
When i run the script, i received the following error

python add.py
Traceback (most recent call last):
  File "add.py", line 34, in add
    thistime = adder( self.wTree.get_widget("entryNumber1").get_text(),
self.wTree.get_widget("entryNumber2").get_text())
AttributeError: 'NoneType' object has no attribute 'get_text'

What has to be done to overcome this error?

Regards

Raji. S
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