I have the same issue as Jeroen.

Environment Information : 
System : Linux-2.6.32-33-generic-x86_64-with-Ubuntu-10.04-lucid
OS Name : posix
Distributor ID:	Ubuntu
Description:	Ubuntu 10.04.3 LTS
Release:	10.04
Codename:	lucid
Operating System Release : 2.6.32-33-generic
Operating System Version : #72-Ubuntu SMP Fri Jul 29 21:07:13 UTC 2011
Operating System Architecture : 64bit
Operating System Locale : en_US.UTF8
Python Version : 2.6.5
OpenERP-Client Version : 6.0.3
Last revision No. & ID :Bazaar Package not Found !Traceback (most recent call last):
  File "/home/openerp/openerp-server/openerp-server-6/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/home/openerp/openerp-server/openerp-server-6/bin/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/home/openerp/openerp-server/openerp-server-6/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/openerp/openerp-server/openerp-server-6/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/openerp/openerp-server/openerp-server-6/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/openerp/openerp-server/openerp-server-6/bin/addons/base_sale_multichannels/sale.py", line 153, in export_catalog
    self.export_products(cr, uid, shop, context)
  File "/home/openerp/openerp-server/openerp-server-6/bin/addons/base_sale_multichannels/sale.py", line 138, in export_products
    self.export_products_collection(cr, uid, shop, context)
  File "/home/openerp/openerp-server/openerp-server-6/bin/addons/base_sale_multichannels/sale.py", line 135, in export_products_collection
    self.pool.get('product.product').ext_export(cr, uid, product_to_export, [shop.referential_id.id], {}, context)
  File "/home/openerp/openerp-server/magentoerpconnect/magentoerpconnect/product.py", line 1039, in ext_export
    self.ext_assign_links(cr, uid, id, external_referential_ids=external_referential_ids, defaults=defaults, context=context_storeview)
  File "/home/openerp/openerp-server/magentoerpconnect/magentoerpconnect/product.py", line 1084, in ext_assign_links
    external_referential_ids=external_referential_ids, defaults=defaults, context=context)
  File "/home/openerp/openerp-server/magentoerpconnect/magentoerpconnect/product.py", line 1110, in ext_product_assign
    child_list = conn.call('product_link.list', data) # get the sku of the products already assigned
  File "/home/openerp/openerp-server/magentoerpconnect/magentoerpconnect/magerp_osv.py", line 53, in call
    res = self.ser.call(self.session, method, arguments)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
Fault: <Fault 101: 'Product not exists.'>