When i click on the Reporting -> Dashboard -> sales.

generate an error like this.

OpenERP Server Error

Client Traceback (most recent call last): File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\http.py", line 204, in dispatch File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\controllers\main.py", line 1133, in call_kw File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\controllers\main.py", line 1125, in _call_kw File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\session.py", line 42, in proxy File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\session.py", line 30, in proxy_method File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\session.py", line 103, in send Server Traceback (most recent call last): File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\openerp\addons\web\session.py", line 89, in send File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\netsvc.py", line 296, in dispatch_rpc File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\service\web_services.py", line 626, in dispatch File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\osv\osv.py", line 190, in execute_kw File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\osv\osv.py", line 132, in wrapper File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\osv\osv.py", line 199, in execute File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\osv\osv.py", line 187, in execute_cr File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\osv\orm.py", line 2768, in read_group File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\sql_db.py", line 161, in wrapper File "C:\Program Files (x86)\OpenERP 7.0-20141211-015804\server\.\openerp\sql_db.py", line 226, in execute DataError: division by zero

How can be solve this.

now i upgrade the sales management module ,But still the error is displayed.