what wrong with my odoo 11

[abunajmi]

I have got error when acess odoo what the couse of this error hope you could give help thanks

25485 ERROR ? werkzeug: Error on request:
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/werkzeug/serving.py", line 270, in run_wsgi
execute(self.server.app)
File "/usr/local/lib/python3.5/dist-packages/werkzeug/serving.py", line 258, in execute
application_iter = app(environ, start_response)
File "/opt/odoo/odoo/odoo/service/server.py", line 260, in app
return self.app(e, s)
File "/opt/odoo/odoo/odoo/service/wsgi_server.py", line 166, in application
return application_unproxied(environ, start_response)
File "/opt/odoo/odoo/odoo/service/wsgi_server.py", line 154, in application_unproxied
result = handler(environ, start_response)
File "/opt/odoo/odoo/odoo/http.py", line 1319, in call
return self.dispatch(environ, start_response)
File "/opt/odoo/odoo/odoo/http.py", line 1293, in call
return self.app(environ, start_wrapped)
File "/usr/local/lib/python3.5/dist-packages/werkzeug/wsgi.py", line 766, in call
return self.app(environ, start_response)
File "/opt/odoo/odoo/odoo/http.py", line 1456, in dispatch
self.setup_db(httprequest)
File "/opt/odoo/odoo/odoo/http.py", line 1388, in setup_db
httprequest.session.db = db_monodb(httprequest)
File "/opt/odoo/odoo/odoo/http.py", line 1540, in db_monodb
dbs = db_list(True, httprequest)
File "/opt/odoo/odoo/odoo/http.py", line 1507, in db_list
dbs = odoo.service.db.list_dbs(force)
File "/opt/odoo/odoo/odoo/service/db.py", line 369, in list_dbs
with closing(db.cursor()) as cr:
File "/opt/odoo/odoo/odoo/sql_db.py", line 637, in cursor
return Cursor(self.__pool, self.dbname, self.dsn, serialized=serialized)
File "/opt/odoo/odoo/odoo/sql_db.py", line 178, in init
self._cnx = pool.borrow(dsn)
File "/opt/odoo/odoo/odoo/sql_db.py", line 520, in _locked
return fun(self, *args, **kwargs)
File "/opt/odoo/odoo/odoo/sql_db.py", line 588, in borrow
**connection_info)
File "/usr/local/lib/python3.5/dist-packages/psycopg2/init.py", line 130, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: FATAL: role "root" does not exist