ValueError: No references to stock.report_picking_list in Openerp
===

I get the following error when i update my openerp-server6.0.I work on Opensuse OS any help?


    Traceback (most recent call last):
    File "./openerp-server.py", line 121, in <module>
    db,pool = pooler.get_db_and_pool(dbname, update_module=tools.config['init'] or         tools.config['update'], pooljobs=False)
    File "workspace/openERP/src/openerp-server/bin/pooler.py", line 39, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
    File "workspace/openERP/src/openerp-server/bin/addons/__init__.py", line 883, in load_modules
    processed_modules.extend(load_module_graph(cr, graph, status, report=report,skip_modules=processed_modules))
    File "workspace/openERP/src/openerp-server/bin/addons/__init__.py", line 748, in load_module_graph
    load_init_update_xml(cr, m, idref, mode, kind)
    File "workspace/openERP/src/openerp-server/bin/addons/__init__.py", line 641, in load_init_update_xml
    tools.convert_xml_import(cr, m, fp, idref, mode=mode, **kwargs)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 975, in convert_xml_import
    obj.parse(doc.getroot())
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 865, in parse
    self._tags[rec.tag](self.cr, rec, n)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 826, in _tag_record
    f_val = _eval_xml(self,field, self.pool, cr, self.uid, self.idref)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 152, in _eval_xml
    idref)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 146, in _process
    idref[id]=self.id_get(cr, id)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 842, in id_get
    res = self.model_id_get(cr, id_str)
    File "workspace/openERP/src/openerp-server/bin/tools/convert.py", line 851, in model_id_get
    return model_data_obj.get_object_reference(cr, self.uid, mod, id_str)
    File "workspace/openERP/src/openerp-server/bin/tools/misc.py", line 823, in cached_result
    result2 = fn(self2, cr, *args[:self.skiparg-2], **kwargs2)
    File "workspace/openERP/src/openerp-server/bin/addons/base/ir/ir_model.py", line 609, in get_object_reference
    data_id = self._get_id(cr, uid, module, xml_id)
    File "workspace/openERP/src/openerp-server/bin/tools/misc.py", line 823, in cached_result
    result2 = fn(self2, cr, *args[:self.skiparg-2], **kwargs2)
    File "workspace/openERP/src/openerp-server/bin/addons/base/ir/ir_model.py", line 602, in _get_id
    raise ValueError('No references to %s.%s' % (module, xml_id))
    ValueError: No references to stock.report_picking_list
