I'm sorry, I misunderstood, I thought you were using python 2 and changed 
to python 3. It appears you kept using python 2 but tried python 3 at one 
time. Delete the session files in the sessions folder of admin and your 
application, delete the error files in the errors folder of admin and your 
application, finally perform a fake migration.  
  
The reason you need to do this to stop having errors is that web2py stores 
pickles in those files and the pickle format is different between 2 and 3 
so if you have a pickle generated with python 3 it will cause an error when 
you try to open it with python 2.  
  
You do not need to remove python 3, you just need to be aware of this 
problem so you delete those files after trying your app with python 3.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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