error on click on pdf export

[mhabou]

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/werkzeug/serving.py", line 177, in run_wsgi
execute(self.server.app)
File "/usr/lib/python2.7/dist-packages/werkzeug/serving.py", line 165, in execute
application_iter = app(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/service/server.py", line 290, in app
return self.app(e, s)
File "/home/inovativ/workspace/Odoo/openerp/service/wsgi_server.py", line 216, in application
return application_unproxied(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/service/wsgi_server.py", line 202, in application_unproxied
result = handler(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1290, in call
return self.dispatch(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1264, in call
return self.app(environ, start_wrapped)
File "/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 579, in call
return self.app(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1264, in call
return self.app(environ, start_wrapped)
File "/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 579, in call
return self.app(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1264, in call
return self.app(environ, start_wrapped)
File "/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 579, in call
return self.app(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1264, in call
return self.app(environ, start_wrapped)
File "/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 579, in call
return self.app(environ, start_response)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 1435, in dispatch
result = ir_http._dispatch()
File "/home/inovativ/workspace/Odoo/openerp/addons/base/ir/ir_http.py", line 177, in _dispatch
return self._handle_exception(e)
File "/home/inovativ/workspace/Odoo/openerp/addons/base/ir/ir_http.py", line 147, in _handle_exception
return request._handle_exception(exception)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 666, in _handle_exception
return super(HttpRequest, self)._handle_exception(exception)
File "/home/inovativ/workspace/Odoo/openerp/addons/base/ir/ir_http.py", line 173, in _dispatch
result = request.dispatch()
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 684, in dispatch
r = self._call_function(*_self.params)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 310, in _call_function
return checked_call(self.db, *args, *_kwargs)
File "/home/inovativ/workspace/Odoo/openerp/service/model.py", line 113, in wrapper
return f(dbname, _args, *_kwargs)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 307, in checked_call
return self.endpoint(_a, *_kw)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 803, in call
return self.method(_args, *_kw)
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 403, in response_wrap
response = f(_args, *_kw)
File "/home/inovativ/workspace/Odoo/tmsdemo/web_printscreen_zb/controllers.py", line 183, in index
cookies={'fileToken': token})
File "/home/inovativ/workspace/Odoo/openerp/http.py", line 706, in make_response
response.set_cookie(k, v)
File "/usr/lib/python2.7/dist-packages/werkzeug/wrappers.py", line 992, 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