I was trying to install travel_car_rental Module and it came up with the following error. Then I tried installing the dependencies, still get the same error. Now this error comes for any module that I try to install

Odoo Server ErrorTraceback (most recent call last): File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 599, in _handle_exception File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 636, in dispatch File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 315, in _call_function File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\service\model.py", line 118, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 308, in checked_call File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 887, in __call__ File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\http.py", line 465, in response_wrap File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\web\controllers\main.py", line 975, in call_button File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\web\controllers\main.py", line 963, in _call_kw File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\api.py", line 232, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\base\module\module.py", line 459, in button_immediate_install File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\api.py", line 232, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\base\module\module.py", line 533, in _button_immediate_function File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\modules\registry.py", line 385, in new File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\modules\loading.py", line 337, in load_modules File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\modules\loading.py", line 237, in load_marked_modules File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\modules\loading.py", line 159, in load_module_graph File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\modules\loading.py", line 98, in _load_data File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 852, in convert_file File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 939, in convert_xml_import File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 802, in parse File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 805, in parse File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 703, in _tag_record File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 122, in _eval_xml File "<string>", line 1, in <module> File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 54, in <lambda> File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 783, in id_get File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\convert.py", line 794, in model_id_get File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\api.py", line 232, in wrapper File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\base\ir\ir_model.py", line 966, in xmlid_to_res_model_res_id File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\api.py", line 232, in wrapper File "<string>", line 2, in xmlid_lookup File "C:\Program Files (x86)\Odoo 9.0-20151031\server\.\openerp\tools\cache.py", line 85, in lookup File "C:\Program Files (x86)\Odoo 9.0-20151031\server\openerp\addons\base\ir\ir_model.py", line 956, in xmlid_lookupParseError: "External ID not found in the system: base.res_partner_address_6" while parsing file:///C:/Program Files (x86)/Odoo 9.0-20151031/server/openerp/addons/travel/demo/travel.xml:5, near<record id="demo_travel_fosdem_2015" model="travel.travel"> <field name="name">Travel to FOSDEM 2015</field> <field name="date_start">2015-01-30</field> <field name="date_stop">2015-02-01</field> <field name="passenger_ids" eval="[ (0, 0, {'partner_id': ref('base.res_partner_address_4')}), (0, 0, {'partner_id': ref('base.res_partner_address_5')}), (0, 0, {'partner_id': ref('base.res_partner_address_6')}), ]"/> </record>

I guess this travel module has affected some code. where could be the problem. I am new to Odoo, hence any answers for this issue a detailed explanation will help

Thanks in advance