Comment 9 for bug 1193563

I have the exact same error when trying to export an invoice.

And with the werkzeug version from the (debian testing) packages:

252k (diff: 4096k)('oe_sercom_dev', 1, '*', u'account.invoice', 'export_data', (...), {})
2013-06-27 14:55:20,359 29306 ERROR oe_sercom_dev openerp.addons.web.http.HttpRequest.dispatch: An error occurred while handling a json request
Traceback (most recent call last):
  File "/home/openeyedev/var/projects/oe_sercom/web/addons/web/http.py", line 285, in dispatch
    r = method(self, **self.params)
  File "/home/openeyedev/var/projects/oe_sercom/web/addons/web/controllers/main.py", line 1627, in index
    cookies={'fileToken': int(token)})
  File "/home/openeyedev/var/projects/oe_sercom/web/addons/web/http.py", line 332, in make_response
    response.set_cookie(k, v)
  File "/usr/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 960, in set_cookie
    self.charset))
  File "/usr/lib/python2.7/dist-packages/werkzeug/http.py", line 905, in dump_cookie
    value = to_bytes(value, charset)
  File "/usr/lib/python2.7/dist-packages/werkzeug/_compat.py", line 106, in to_bytes
    raise TypeError('Expected bytes')
TypeError: Expected bytes