Instead of:
session.a= session.a + 1

Use:
session.a= (session.a or 0) + 1

As session.a will return None if a isn't there and you can't add None and 1.

Also you need to understand that 127.0.0.1 is the loopback address so we 
can't really see the tickets you have there.

-- 
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- 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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