Error in export invoice

I'm using OCB branch for server and addons, and te latest magentoerpconnect connector whih respective dependencies (e-commerce, openobject-extension...)

I'm getting this error when I try to export the invoice to magento:

 openerp.osv.osv: Uncaught exception
Traceback (most recent call last):
  File "/opt/openerp/openerp/osv/osv.py", line 129, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/opt/openerp/openerp/osv/osv.py", line 195, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/opt/openerp/openerp/osv/osv.py", line 183, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/opt/openerp/openerp/addons/base_sale_multichannels/sale.py", line 479, in export_invoices
    self._export_invoice_for_shop(cr, uid, external_session, shop, context=context)
  File "/opt/openerp/openerp/addons/base_sale_multichannels/sale.py", line 489, in _export_invoice_for_shop
    with new_cursor(cr, external_session.logger) as new_cr:
NameError: global name 'new_cursor' is not defined
2014-02-26 13:56:16,336 846 ERROR ? openerp.netsvc: global name 'new_cursor' is not defined