Openerp7.0的ir.attachment出错，如何排查错误？
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哪位大侠指点一下，我该如何排查这个错误。
出现问题现象：文档不能以目录分类来显示，可以用所有者和日期来分类。该如何解决？
OpenERP Server Error
Client Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/http.py", line 204, in dispatch
response["result"] = method(self, **self.params)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/controllers/main.py", line 1051, in search_read
return self.do_search_read(req, model, fields, offset, limit, domain, sort)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/controllers/main.py", line 1086, in do_search_read
records = Model.read(ids, fields or False, req.context)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/session.py", line 42, in proxy
result = self.proxy.execute_kw(self.session._db, self.session._uid, self.session._password, self.model, method, args, kw)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/session.py", line 30, in proxy_method
result = self.session.send(self.service_name, method, *args)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/session.py", line 103, in send
raise xmlrpclib.Fault(openerp.tools.ustr(e), formatted_info)
Server Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/web/session.py", line 89, in send
return openerp.netsvc.dispatch_rpc(service_name, method, args)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/netsvc.py", line 296, in dispatch_rpc
result = ExportService.getService(service_name).dispatch(method, params)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/service/web_services.py", line 626, in dispatch
res = fn(db, uid, *params)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/osv.py", line 190, in execute_kw
return self.execute(db, uid, obj, method, *args, **kw or {})
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/osv.py", line 132, in wrapper
return f(self, dbname, *args, **kwargs)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/osv.py", line 199, in execute
res = self.execute_cr(cr, uid, obj, method, *args, **kw)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/audittrail/audittrail.py", line 532, in execute_cr
return fct_src(cr, uid, model, method, *args, **kw)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/osv.py", line 187, in execute_cr
return getattr(object, method)(cr, uid, *args, **kw)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/base/ir/ir_attachment.py", line 269, in read
return super(ir_attachment, self).read(cr, uid, ids, fields_to_read, context, load)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/orm.py", line 3679, in read
result = self._read_flat(cr, user, select, fields, context, load)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/orm.py", line 3800, in _read_flat
res2 = self._columns[f].get(cr, self, ids, f, user, context=context, values=res)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/fields.py", line 468, in get
context=context))
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/addons/base/res/res_partner.py", line 548, in name_get
name = "%s, %s" % (record.parent_id.name, name)
File "/usr/lib/python2.6/site-packages/openerp-7.0_20140530_231147-py2.6.egg/openerp/osv/orm.py", line 504, in getattr
raise AttributeError(e)
AttributeError: 402