title: Odoo 8 error: werkzeug: Error on request:
body: <p>When I start odoo server, it starts correctly, showing the OK mesage:</p>
  
  <pre><code>root@des [/opt/odoo/addons/web]# /etc/init.d/odoo start
  Starting Odoo Server Daemon (odoo-server):                 [  OK  ]
  root@des [/opt/odoo/addons/web]#
  </code></pre>
  
  <p>When I see log file, I see this:</p>
  
  <pre><code>root@des [/opt/odoo/addons/web]# tail -50 /var/log/odoo/odoo-server.log
  2015-04-04 19:46:33,637 21486 INFO ? openerp: OpenERP version 8.0
  2015-04-04 19:46:33,637 21486 INFO ? openerp: addons paths: ['/home/odoo/.local/share/Odoo/addons/8.0', u'/opt/odoo/addons', '/opt/odoo/openerp/addons']
  2015-04-04 19:46:33,637 21486 INFO ? openerp: database hostname: localhost
  2015-04-04 19:46:33,637 21486 INFO ? openerp: database port: 5432
  2015-04-04 19:46:33,637 21486 INFO ? openerp: database user: odoo
  2015-04-04 19:46:33,931 21486 INFO ? openerp.service.server: HTTP service (werkzeug) running on 0.0.0.0:8069
  root@des [/opt/odoo/addons/web]#
  </code></pre>
  
  <p>The first time I connect to the site, I get an internal server error web page, and this error in the log:</p>
  
  <pre><code>2015-04-04 20:08:31,283 25128 INFO ? openerp.addons.bus.bus: Bus.loop listen imbus on db postgres
  2015-04-04 20:08:31,961 25128 INFO ? openerp.addons.report.models.report: Will use the Wkhtmltopdf binary at /usr/bin/wkhtmltopdf
  2015-04-04 20:08:31,981 25128 ERROR ? werkzeug: Error on request:
  Traceback (most recent call last):
    File "/home/odoo/odoo/lib/python2.7/site-packages/werkzeug/serving.py", line 180, in run_wsgi
      execute(self.server.app)
    File "/home/odoo/odoo/lib/python2.7/site-packages/werkzeug/serving.py", line 168, in execute
      application_iter = app(environ, start_response)
    File "/opt/odoo/openerp/service/server.py", line 281, in app
      return self.app(e, s)
    File "/opt/odoo/openerp/service/wsgi_server.py", line 216, in application
      return application_unproxied(environ, start_response)
    File "/opt/odoo/openerp/service/wsgi_server.py", line 202, in application_unproxied
      result = handler(environ, start_response)
    File "/opt/odoo/openerp/http.py", line 1279, in __call__
      self.load_addons()
    File "/opt/odoo/openerp/http.py", line 1298, in load_addons
      m = __import__('openerp.addons.' + module)
    File "/opt/odoo/openerp/modules/module.py", line 80, in load_module
      mod = imp.load_module('openerp.addons.' + module_part, f, path, descr)
    File "/opt/odoo/addons/report/__init__.py", line 2, in &lt;module&gt;
      import models
    File "/opt/odoo/addons/report/models/__init__.py", line 1, in &lt;module&gt;
      import report
    File "/opt/odoo/addons/report/models/report.py", line 71, in &lt;module&gt;
      version = re.search('([0-9.]+)', out).group(0)
  AttributeError: 'NoneType' object has no attribute 'group'
  </code></pre>
  
  <p>How can I solve that error?</p>
  
  <p>Thanks
  Jaime</p>