i have install well my odoo in my computer now if i tried to open session aand create data base i have this error plse help me .

Traceback (most recent call last): File "/opt/openerp/odoo/openerp/http.py", line 476, in _handle_exception return super(JsonRequest, self)._handle_exception(exception) File "/opt/openerp/odoo/openerp/http.py", line 495, in dispatch result = self._call_function(**self.params) File "/opt/openerp/odoo/openerp/http.py", line 312, in _call_function return self.endpoint(*args, **kwargs) File "/opt/openerp/odoo/openerp/http.py", line 685, in __call__ return self.method(*args, **kw) File "/opt/openerp/odoo/openerp/http.py", line 360, in response_wrap response = f(*args, **kw) File "/opt/openerp/odoo/addons/web/controllers/main.py", line 757, in create params['create_admin_pwd']) File "/opt/openerp/odoo/openerp/http.py", line 759, in proxy_method result = dispatch_rpc(self.service_name, method, args) File "/opt/openerp/odoo/openerp/http.py", line 93, in dispatch_rpc result = dispatch(method, params) File "/opt/openerp/odoo/openerp/service/db.py", line 70, in dispatch return fn(*params) File "/opt/openerp/odoo/openerp/service/db.py", line 87, in exp_create_database _create_empty_database(db_name) File "/opt/openerp/odoo/openerp/service/db.py", line 82, in _create_empty_database cr.execute("""CREATE DATABASE "%s" ENCODING 'unicode' TEMPLATE "%s" """ % (name, chosen_template)) File "/opt/openerp/odoo/openerp/sql_db.py", line 155, in wrapper return f(self, *args, **kwargs) File "/opt/openerp/odoo/openerp/sql_db.py", line 230, in execute res = self._obj.execute(query, params) ProgrammingError: permission denied to create database