I downloaded odoo on 5th november from nightly  and thenI installed CRM, Project, Calendar, Notes, Social networking modules and from the messaging menu when i clicked calendar to create a recurring event of any type then the following error is shown... after wards on 28th November i once again downloaded latest nightly version and again the same error generated

==================================================

OpenERP Server Error

Traceback (most recent call last): File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 508, in _handle_exception File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 526, in dispatch File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 285, in _call_function File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\service\model.py", line 113, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 282, in checked_call File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 742, in __call__ File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\http.py", line 378, in response_wrap File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\web\controllers\main.py", line 949, in call_kw File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\web\controllers\main.py", line 941, in _call_kw File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\mail\mail_message.py", line 579, in message_read File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\mail\mail_message.py", line 453, in _message_read_add_expandables File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\models.py", line 1621, in search_count File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\calendar\calendar.py", line 1716, in search File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\models.py", line 1642, in search File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\portal\mail_message.py", line 38, in _search File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\openerp\addons\mail\mail_message.py", line 621, in _search File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\models.py", line 4556, in _search File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\api.py", line 237, in wrapper File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\models.py", line 4381, in _where_calc File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\osv\expression.py", line 1245, in to_sql File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\osv\expression.py", line 1229, in __leaf_to_sql File "e:\Program Files\Odoo 8.0-20141128-010203\server\.\openerp\osv\fields.py", line 241, in <lambda> ValueError: invalid literal for int() with base 10: '8-20141209000000'

============================================================

Is there any one who can help me in this regard please???