TypeError: a float is required

[zis]

How to Reproduce

While doing a GET operation on /wiki, Trac issued an internal error.

when I used trac as a cgi module, everything was ok, but very slow. After I installed mod_python and changed my httpd.conf, I have such an error. My httpd.conf section:
<Location "/trac">

SetHandler mod_python

PythonInterpreter main_interpreter

PythonHandler trac.web.modpython_frontend

PythonOption TracEnv "/usr/share/trac/projects/vegspace_ru"

</Location>"

User Agent was: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; ru; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2

System Information

Trac	0.11.5
Python	2.5.4 (r254:67916, Jul 23 2009, 04:25:45) [GCC 3.4.6 [FreeBSD] 20060305]
setuptools	0.6c9
MySQL	server: "5.1.36", client: "5.0.67", thread-safe: 0
MySQLdb	1.2.3c1
Genshi	0.5.1
mod_python	3.3.1
jQuery:	1.2.6

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11.5-py2.5.egg/trac/web/main.py", line 444, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11.5-py2.5.egg/trac/web/main.py", line 205, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11.5-py2.5.egg/trac/wiki/web_ui.py", line 118, in process_request
    page = WikiPage(self.env, pagename)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11.5-py2.5.egg/trac/wiki/model.py", line 43, in __init__
    self._fetch(name, version, db)
  File "/usr/local/lib/python2.5/site-packages/Trac-0.11.5-py2.5.egg/trac/wiki/model.py", line 70, in _fetch
    self.time = datetime.fromtimestamp(time, utc)
TypeError: a float is required