Export Product from OpenErp6.1 to Magento1.7

Hello , I got this error message when I try to export product from OpenErp 6.1 to MAgento1.7:

Traceback (most recent call last):
  File "/opt/openerp/openerp-6.1-1/openerp/osv/osv.py", line 121, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/opt/openerp/openerp-6.1-1/openerp/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/opt/openerp/openerp-6.1-1/openerp/osv/osv.py", line 164, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_sale_export_product/wizard/export_product.py", line 77, in export_product
    return self.export(cr, uid, id, ['export_product'], context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_sale_export_product/wizard/export_product.py", line 73, in export
    self._export_one_product(cr, uid, external_session, product_id, options, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/product_links_sync/product.py", line 128, in _export_one_product
    res = super(product_export_wizard, self)._export_one_product(cr, uid, external_session, product_id, options, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_sale_export_product/wizard/export_product.py", line 40, in _export_one_product
    product_obj._export_one_resource(cr, uid, external_session, product_id, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_external_referentials/external_osv.py", line 1129, in _export_one_resource
    False, mapping, mapping_id, defaults=defaults, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_external_referentials/decorator.py", line 49, in wrapped
    return func(self, cr, uid, argument, *args, **kwargs)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_external_referentials/decorator.py", line 110, in wrapper
    return func(self, cr, uid, external_session, resource, *args, **kwargs)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/magentoerpconnect/magerp_osv.py", line 47, in _transform_and_send_one_resource
    return self.mag_transform_and_send_one_resource(cr, uid, external_session, *args, **kwargs)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_external_referentials/external_osv.py", line 1110, in _transform_and_send_one_resource
    return self.send_to_external(cr, uid, external_session, {resource_id : resource}, mapping, mapping_id, update_date, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/magentoerpconnect/product.py", line 1067, in send_to_external
    self.export_inventory(cr, uid, external_session, product_ids, context=context)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/magentoerpconnect/product.py", line 1436, in export_inventory
    self._export_inventory(cr, uid, external_session, product_id, context=location_ctx)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/base_external_referentials/decorator.py", line 110, in wrapper
    return func(self, cr, uid, external_session, resource, *args, **kwargs)
  File "/opt/openerp/openerp-6.1-1/openerp/addons/magentoerpconnect/product.py", line 1452, in _export_inventory
    [mag_product_id, inventory_vals])
  File "/opt/openerp/openerp-6.1-1/openerp/addons/magentoerpconnect/magerp_osv.py", line 223, in call
    res = self.ser.call(self.session, method, arguments)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1578, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.7/xmlrpclib.py", line 1264, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1297, in single_request
    return self.parse_response(response)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1473, in parse_response
    return u.close()
  File "/usr/lib/python2.7/xmlrpclib.py", line 793, in close
    raise Fault(**self._stack[0])
Fault: <Fault 3: 'Invalid api path.'>

Have you any idea ??????