opening stock invertory getting Error

Client Traceback (most recent call last): File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/http.py”, line 195, in dispatch response[“result”] = method(self, **self.params) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/controllers/main.py”, line 709, in get_list return db_list(req) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/controllers/main.py”, line 88, in db_list dbs = proxy.list() File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/session.py”, line 31, in proxy_method result = self.session.send(self.service_name, method, *args) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/session.py”, line 104, in send raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info)

Server Traceback (most recent call last): File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/addons/web/session.py”, line 90, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/netsvc.py”, line 295, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/service/web_services.py”, line 122, in dispatch return fn(*params) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/service/web_services.py”, line 351, in exp_list cr = db.cursor() File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/sql_db.py”, line 485, in cursor return Cursor(self._pool, self.dbname, serialized=serialized) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/sql_db.py”, line 183, in init self._cnx = pool.borrow(dsn(dbname)) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/sql_db.py”, line 378, in _locked return fun(self, *args, **kwargs) File “/usr/lib/python2.6/site-packages/openerp-7.0_20130301_002301-py2.6.egg/openerp/sql_db.py”, line 441, in borrow result = psycopg2.connect(dsn=dsn, connection_factory=PsycoConnection) File “/usr/lib64/python2.6/site-packages/psycopg2/init.py”, line 130, in connect conn = _connect(dsn, connection_factory=connection_factory, **kwasync) OperationalError: FATAL: role “openerp” does not exist