Hi,
  A common cause of that error (in my personal, painful experience) is 
requesting the token in one scope (https://adwords.google.com) and then 
using it in another (https://adwords-sandbox.google.com).  This happened to 
me quite a few times while building the Python AppEngine Reporting demo (
http://code.google.com/p/google-api-ads-python/downloads/detail?name=adwords_api_reporting_gae_demo_1.0.0.tar.gz).
 
Note that 14.2.3 of the library is out of date and I released 15.1.2 with 
some improvements to make it easier to use OAuth (no email/password 
required when constructing the AdWordsClient, for example): 
http://code.google.com/p/google-api-ads-python/source/browse/trunk/adspygoogle/adwords/ChangeLog?spec=svn58&r=58

- Kevin Winter
AdWords API Team

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Also find us on our blog and discussion group:
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http://groups.google.com/group/adwords-api
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