I'm using stable 6, 
to install it i use this tutorial, http://www.malagatic.com/blog/item/27-instalaci%C3%B3n-openerp-v6-sobre-ubuntu-1004-lts

and i installed everything from bazar, (this sources)

---

lp:openobject-server/6.0    The server

lp:openobject-addons/6.0   The Addons

lp:openobject-client-web/6.0    Web Client

lp:openobject-addons/extra-6.0    Extra addons

lp:openerp-spain/6.0    Spanish Localizations

---

I'm getting this traceback... (i think it's the same)

<type 'exceptions.TypeError'>	Python 2.6.5: /usr/bin/python
Tue Mar 15 12:24:17 2011
A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.

 /usr/local/lib/python2.6/dist-packages/CherryPy-3.2.0-py2.6.egg/cherrypy/_cprequest.py in respond(self=<cherrypy._cprequest.Request object>, path_info='/openerp/execute')
  643                     if self.handler:
  644                         self.stage = 'handler'
  645                         response.body = self.handler()
  646                     
  647                     # Finalize
response = <cherrypy._cprequest.Response object>, response.body = [], self = <cherrypy._cprequest.Request object>, self.handler = <cherrypy._cpdispatch.LateParamPageHandler object>
 /usr/local/lib/python2.6/dist-packages/CherryPy-3.2.0-py2.6.egg/cherrypy/lib/encoding.py in __call__(self=<cherrypy.lib.encoding.ResponseEncoder instance>, *args=(), **kwargs={})
  186     def __call__(self, *args, **kwargs):
  187         response = cherrypy.serving.response
  188         self.body = self.oldhandler(*args, **kwargs)
  189         
  190         if isinstance(self.body, basestring):
self = <cherrypy.lib.encoding.ResponseEncoder instance>, self.body undefined, self.oldhandler = <cherrypy._cpdispatch.LateParamPageHandler object>, args = (), kwargs = {}
 /usr/local/lib/python2.6/dist-packages/CherryPy-3.2.0-py2.6.egg/cherrypy/_cpdispatch.py in __call__(self=<cherrypy._cpdispatch.LateParamPageHandler object>)
   27     def __call__(self):
   28         try:
   29             return self.callable(*self.args, **self.kwargs)
   30         except TypeError:
   31             x = sys.exc_info()[1]
self = <cherrypy._cpdispatch.LateParamPageHandler object>, self.callable = <bound method Root.default of <openobject.controllers._root.Root object>>, self.args = ('openerp', 'execute'), self.kwargs = {'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='}
 /usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/openobject/tools/_expose.py in func_wrapper(*args=(<openobject.controllers._root.Root object>, 'openerp', 'execute'), **kw={'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='})
  180                 raise cherrypy.HTTPError(405)
  181 
  182             res = func(*args, **kw)
  183             if format == 'json' or (allow_json and 'allow_json' in cherrypy.request.params):
  184                 cherrypy.response.headers['Content-Type'] = 'text/javascript'
global res = '/usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/doc/openerp-web.cfg', func = <function default>, args = (<openobject.controllers._root.Root object>, 'openerp', 'execute'), kw = {'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='}
 /usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/openobject/controllers/_root.py in default(self=<openobject.controllers._root.Root object>, *args=('openerp', 'execute'), **kw={'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='})
   85             request.handler = cherrypy.NotFound()
   86 
   87         return request.handler()
   88 
   89     def find_handler(self):
request = <cherrypy._ThreadLocalProxy object>, request.handler = <cherrypy._cpdispatch.LateParamPageHandler object>
 /usr/local/lib/python2.6/dist-packages/CherryPy-3.2.0-py2.6.egg/cherrypy/_cpdispatch.py in __call__(self=<cherrypy._cpdispatch.LateParamPageHandler object>)
   27     def __call__(self):
   28         try:
   29             return self.callable(*self.args, **self.kwargs)
   30         except TypeError:
   31             x = sys.exc_info()[1]
self = <cherrypy._cpdispatch.LateParamPageHandler object>, self.callable = <function index>, self.args = (), self.kwargs = {'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='}
 /usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/addons/openerp/controllers/utils.py in wrapper(*args=(), **kw={'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='})
  110             # User is logged in; allow access
  111             clear_login_fields(kw)
  112             return fn(*args, **kw)
  113         else:
  114             action = kw.get('login_action', '')
fn = <bound method Execute.index of <openerp.controllers.execute.Execute object>>, args = (), kw = {'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='}
 /usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/openobject/tools/_expose.py in func_wrapper(*args=(<openerp.controllers.execute.Execute object>,), **kw={'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='})
  180                 raise cherrypy.HTTPError(405)
  181 
  182             res = func(*args, **kw)
  183             if format == 'json' or (allow_json and 'allow_json' in cherrypy.request.params):
  184                 cherrypy.response.headers['Content-Type'] = 'text/javascript'
global res = '/usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/doc/openerp-web.cfg', func = <function index>, args = (<openerp.controllers.execute.Execute object>,), kw = {'payload': u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='}
 /usr/local/lib/python2.6/dist-packages/openerp_web-6.0.1-py2.6.egg/addons/openerp/controllers/execute.py in index(self=<openerp.controllers.execute.Execute object>, payload=u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==')
   16         decoded_payload = ast.literal_eval(
   17             zlib.decompress(
   18                 base64.urlsafe_b64decode(payload)))
   19         action, data = decoded_payload['action'], decoded_payload['data']
   20         cherrypy.request.params.update(decoded_payload)
global base64 = <module 'base64' from '/usr/lib/python2.6/base64.pyc'>, base64.urlsafe_b64decode = <function urlsafe_b64decode>, payload = u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='
 /usr/lib/python2.6/base64.py in urlsafe_b64decode(s=u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==')
  110     The alphabet uses '-' instead of '+' and '_' instead of '/'.
  111     """
  112     return b64decode(s, '-_')
  113 
  114 
global b64decode = <function b64decode>, s = u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA=='
 /usr/lib/python2.6/base64.py in b64decode(s=u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==', altchars='-_')
   69     """
   70     if altchars is not None:
   71         s = _translate(s, {altchars[0]: '+', altchars[1]: '/'})
   72     try:
   73         return binascii.a2b_base64(s)
s = u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==', global _translate = <function _translate>, altchars = '-_'
 /usr/lib/python2.6/base64.py in _translate(s=u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==', altchars={'-': '+', '_': '/'})
   34     for k, v in altchars.items():
   35         translation[ord(k)] = v
   36     return s.translate(''.join(translation))
   37 
   38 
s = u'eJxtUstOwzAQ_JXcDBKqOPSA-ADEhRsSh6qyVvG2Xckv-UEo...q5nANC_oOQmkzP4EsVQ_kTRjUJEZQoL2LVWucpukLWii3CA==', s.translate = <built-in method translate of unicode object>, ''.join undefined, translation = ['\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07', '\x08', '\t', '\n', '\x0b', '\x0c', '\r', '\x0e', '\x0f', '\x10', '\x11', '\x12', '\x13', ...]
<type 'exceptions.TypeError'>: character mapping must return integer, None or unicode 
      args = ('character mapping must return integer, None or unicode',) 
      message = 'character mapping must return integer, None or unicode'