JSON 404

[Stefan Helmert]

odoo v8.0rc1, Ubuntu 14.04 (64 bit):

Repeating error message on terminal, no noticable malfunction:

2014-07-13 14:49:15,197 9002 INFO entroserv werkzeug: 10.8.0.6 - - [13/Jul/2014 14:49:15] "POST /web/dataset/search_read HTTP/1.1" 200 -
2014-07-13 14:49:31,011 9002 ERROR entroserv openerp.http: Exception during JSON request handling.
Traceback (most recent call last):
  File "/home/stefan/odoo/openerp/http.py", line 476, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/stefan/odoo/openerp/addons/base/ir/ir_http.py", line 109, in _dispatch
    rule, arguments = self._find_handler(return_rule=True)
  File "/home/stefan/odoo/openerp/addons/base/ir/ir_http.py", line 60, in _find_handler
    return self.routing_map().bind_to_environ(request.httprequest.environ).match(return_rule=return_rule)
  File "/usr/lib/python2.7/dist-packages/werkzeug/routing.py", line 1433, in match
    raise NotFound()
NotFound: 404: Not Found