I have reverse proxied Odoo behind nginx. Sometime I get this error.Now I have no idea where it
is originating. Although If i run Odoo without proxy this does not happen

Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]: 2017-12-03 11:03:57,296 18792 INFO vapelife werkzeug: 127.0.0.1 - - [03/Dec/2017 11:03:57] "GET /web/content/1825-c109479/web.assets_backend.js?cb=1512299037085&fingerprint=c2VwLW5vLXJlZGlyZWN0&onIframeFlag HTTP/1.0" 500 -
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]: 2017-12-03 11:03:57,302 18792 ERROR vapelife werkzeug: Error on request:
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]: Traceback (most recent call last):
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 193, in run_wsgi
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     execute(self.server.app)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/usr/local/lib/python2.7/dist-packages/werkzeug/serving.py", line 181, in execute
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     application_iter = app(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/service/wsgi_server.py", line 184, in application
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return werkzeug.contrib.fixers.ProxyFix(application_unproxied)(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/usr/local/lib/python2.7/dist-packages/werkzeug/contrib/fixers.py", line 152, in __call__
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return self.app(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/service/wsgi_server.py", line 172, in application_unproxied
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     result = handler(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 1308, in __call__
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return self.dispatch(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 1282, in __call__
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return self.app(environ, start_wrapped)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/usr/local/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 599, in __call__
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return self.app(environ, start_response)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 1481, in dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     result = ir_http._dispatch()
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/addons/website_sale/models/ir_http.py", line 15, in _dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return super(IrHttp, cls)._dispatch()
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/addons/website/models/ir_http.py", line 218, in _dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     resp = super(Http, cls)._dispatch()
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/addons/web_editor/models/ir_http.py", line 21, in _dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return super(IrHttp, cls)._dispatch()
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/addons/base/ir/ir_http.py", line 199, in _dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return cls._handle_exception(e)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/addons/website/models/ir_http.py", line 270, in _handle_exception
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return super(Http, cls)._handle_exception(exception)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/addons/base/ir/ir_http.py", line 169, in _handle_exception
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return request._handle_exception(exception)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 768, in _handle_exception
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return super(HttpRequest, self)._handle_exception(exception)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/addons/base/ir/ir_http.py", line 195, in _dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     result = request.dispatch()
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 827, in dispatch
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     r = self._call_function(**self.params)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 333, in _call_function
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return checked_call(self.db, *args, **kwargs)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/service/model.py", line 101, in wrapper
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return f(dbname, *args, **kwargs)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 326, in checked_call
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     result = self.endpoint(*a, **kw)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 935, in __call__
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     return self.method(*args, **kw)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:   File "/opt/odoo/odoo/http.py", line 506, in response_wrap
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]:     response = f(*args, **kw)
Dec 03 11:03:57 ip-172-31-23-193 odoo-server[18786]: TypeError: content_common() got an unexpected keyword argument 'cb'