Cant import attributes

Environment Information :
System : Darwin-10.8.0-x86_64-i386-64bit
OS Name : posix
Your System is not lsb compliant
Operating System Release : 10.8.0
Operating System Version : Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
Operating System Architecture : 64bit
Operating System Locale : en_US.UTF8
Python Version : 2.6.7
OpenERP-Client Version : 6.0.3
Last revision No. & ID :1886 launchpad_translations_on_behalf_of_openerp-20110826051115-p50era3855go1grb
Traceback (most recent call last):
  File "/usr/local/openerp/openerp-server/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/usr/local/openerp/openerp-server/bin/service/web_services.py", line 599, in dispatch
    res = fn(db, uid, *params)
  File "/usr/local/openerp/openerp-server/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/usr/local/openerp/openerp-server/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/usr/local/openerp/openerp-server/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/usr/local/openerp/addons/magentoerpconnect/magerp_core.py", line 131, in sync_attribs
    all_attr_set_ids = attr_set_obj.get_all_extid_from_referential(cr, uid, referential.id, context=context)
  File "/usr/local/openerp/addons/base_external_referentials/external_osv.py", line 117, in get_all_extid_from_referential
    return [oeid_to_extid[oe_id] for oe_id in self.exists(cr, uid, oeid_to_extid.keys(), context=context)]
TypeError: 'bool' object is not iterable