After I updated my Odoo to the latest version (20150519), now I get this error message randomly while I'm using Odoo. Any idea why this comes up? Odoo continues to work fine despite the error message. Maybe a bug in the latest version?

Traceback (most recent call last):

File "C:\Program Files (x86)\Odoo 8.0-20150519\server\.\openerp\http.py", line 530, in _handle_exception

File "C:\Program Files (x86)\Odoo 8.0-20150519\server\.\openerp\http.py", line 1407, in _dispatch_nodb

File "werkzeug\routing.pyc", line 1433, in match

NotFound: 404: Not Found