odoo 9 often show this error:

2016-01-05 07:18:06,741 6787 ERROR None openerp.http: Exception during JSON request handling.

Traceback (most recent call last):

File "/Users/linjun/PycharmProjects/odoo80/openerp/http.py", line 537, in _handle_exception

return super(JsonRequest, self)._handle_exception(exception)

File "/Users/linjun/PycharmProjects/odoo80/openerp/http.py", line 1415, in _dispatch_nodb

func, arguments = self.nodb_routing_map.bind_to_environ(request.httprequest.environ).match()

File "/Library/Python/2.7/site-packages/werkzeug/routing.py", line 1430, in match

raise NotFound()

NotFound: 404: Not Found