Error when synchronizing

[Tim]

I have finished installing magentoerpconnect.

I use this oldstable branch.https://launchpad.net/magentoerpconnect/oerp6.1-oldstable
required branches:
lp:openobject-server/6.1
lp:openobject-addons/6.1
lp:openobject-addons/extra-trunk => for base_sale_multichannels, base_external_referentials, product_m2m_categories
lp:c2c-ecom-addons/6.1 => for product_links

And my magento version is 1.7.0.2

I have finished all the steps including create an soap/xml account in magento.And configured a magento instance in openerp.It is quite sure that my openerp can connect to magento because when I type in a wrong API Key,the system will tell me:
<Error : ('User Error', 'Error connecting to magento, are your sure that your login is right? Did you configure API user in magento?')>.

When I type in the correct API Key(i.e. password),it shows the following information:
I'm not sure if this problem is connected with my magento version cause I can see the highest version option is 1.5.0.0+

OpenERP Server Error
Client Traceback (most recent call last):
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\common\http.py", line 180, in dispatch
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\controllers\main.py", line 1052, in call_button
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\controllers\main.py", line 996, in call_common
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\controllers\main.py", line 1010, in _call_kw
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\common\openerplib\main.py", line 250, in proxy
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\common\openerplib\main.py", line 117, in proxy
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\common\http.py", line 608, in send

Server Traceback (most recent call last):
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\web\common\http.py", line 593, in send
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\netsvc.py", line 360, in dispatch_rpc
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\service\web_services.py", line 586, in dispatch
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\osv.py", line 167, in execute_kw
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\osv.py", line 121, in wrapper
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\osv.py", line 176, in execute
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\osv.py", line 164, in execute_cr
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\magentoerpconnect\magerp_core.py", line 108, in core_sync
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\magentoerpconnect\magerp_osv.py", line 288, in mage_import_base
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\base_external_referentials\external_osv.py", line 615, in ext_import
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\base_external_referentials\external_osv.py", line 545, in _ext_import_one_cr
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\base_external_referentials\external_osv.py", line 486, in _ext_import_one
  File "D:\Program Files\OpenERP 6.1\Server\server\openerp\addons\base_external_referentials\external_osv.py", line 655, in oe_create
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\orm.py", line 4239, in create
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\orm.py", line 4388, in _store_set_values
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\fields.py", line 1136, in get
  File "D:\Program Files\OpenERP 6.1\Server\server\.\openerp\osv\fields.py", line 1110, in postprocess
KeyError: 22L