I'm getting this error:

2015-02-18 20:30:03,930 INFO Bus.loop listen imbus on db postgres
2015-02-18 20:30:03,969 ERROR Bus.loop error, sleep and retry
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/openerp/addons/bus/bus.py", line 136, in run
    self.loop()
  File "/usr/lib/python2.7/site-packages/openerp/addons/bus/bus.py", line 119, in loop
    if select.select([conn], [], [], TIMEOUT) == ([],[],[]):
TypeError: argument must be an int, or have a fileno() method.
 

Do you know how to resolve it?