A bug of webpy example code

[batma...@gmail.com]

Hi, when i run the blog example code of webpy, http://webpy.org/src/blog/0.3 , there is an bug after i post a blog, as bellow:

Traceback (most recent call last):

  File "/usr/lib/python2.7/dist-packages/web/application.py", line 239, in process

    return self.handle()

  File "/usr/lib/python2.7/dist-packages/web/application.py", line 230, in handle

    return self._delegate(fn, self.fvars, args)

  File "/usr/lib/python2.7/dist-packages/web/application.py", line 420, in _delegate

    return handle_class(cls)

  File "/usr/lib/python2.7/dist-packages/web/application.py", line 396, in handle_class

    return tocall(*args)

  File "/root/BasicBlog/blog.py", line 28, in GET

    return render.index(posts)

  File "/usr/lib/python2.7/dist-packages/web/template.py", line 1020, in template

    return self._base(t(*a, **kw))

  File "/usr/lib/python2.7/dist-packages/web/template.py", line 881, in __call__

    return BaseTemplate.__call__(self, *a, **kw)

  File "/usr/lib/python2.7/dist-packages/web/template.py", line 808, in __call__

    return self.t(*a, **kw)

  File "templates/index.html", line 13, in __template__

  File "/usr/lib/python2.7/dist-packages/web/utils.py", line 905, in datestr

    delta = now - then

TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'unicode'

My webpy version: 

root@iZ287xcvr93Z:~# aptitude show python-webpy

Package: python-webpy                    

State: installed

Automatically installed: no

Version: 1:0.37+20120626-1

My Ubuntu version: 12.04

Who can help me?