Server Traceback (most recent call last): File "/opt/openerp/server-7/openerp/addons/web/session.py", line 90, in send return openerp.netsvc.dispatch_rpc(service_name, method, args) File "/opt/openerp/server-7/openerp/netsvc.py", line 293, in dispatch_rpc result = ExportService.getService(service_name).dispatch(method, params) File "/opt/openerp/server-7/openerp/service/web_services.py", line 626, in dispatch res = fn(db, uid, *params) File "/opt/openerp/server-7/openerp/osv/osv.py", line 188, in execute_kw return self.execute(db, uid, obj, method, *args, **kw or {}) File "/opt/openerp/server-7/openerp/osv/osv.py", line 131, in wrapper return f(self, dbname, *args, **kwargs) File "/opt/openerp/server-7/openerp/osv/osv.py", line 197, in execute res = self.execute_cr(cr, uid, obj, method, *args, **kw) File "/opt/openerp/server-7/openerp/addons/audittrail/audittrail.py", line 514, in execute_cr return fct_src(cr, uid, model, method, *args, **kw) File "/opt/openerp/server-7/openerp/osv/osv.py", line 185, in execute_cr return getattr(object, method)(cr, uid, *args, **kw) File "/opt/openerp/server-7/openerp/addons/mail/mail_thread.py", line 242, in create thread_id = super(mail_thread, self).create(cr, uid, values, context=context) File "/opt/openerp/server-7/openerp/osv/orm.py", line 4487, in create self.check_access_rule(cr, user, [id_new], 'create', context=context) File "/opt/openerp/server-7/openerp/osv/orm.py", line 3905, in check_access_rule where_clause, where_params, tables = self.pool.get('ir.rule').domain_get(cr, uid, self._name, operation, context=context) File "/opt/openerp/server-7/openerp/addons/base/ir/ir_rule.py", line 150, in domain_get dom = self._compute_domain(cr, uid, model_name, mode) File "/opt/openerp/server-7/openerp/tools/cache.py", line 18, in lookup r = self.lookup(self2, cr, *args) File "/opt/openerp/server-7/openerp/tools/cache.py", line 46, in lookup value = d[key] = self.method(self2, cr, *args) File "/opt/openerp/server-7/openerp/addons/base/ir/ir_rule.py", line 130, in _compute_domain rule_domain = self.read(cr, uid, rule.id, ['domain'])['domain'] File "/opt/openerp/server-7/openerp/osv/orm.py", line 3604, in read result = self._read_flat(cr, user, select, fields, context, load) File "/opt/openerp/server-7/openerp/osv/orm.py", line 3724, in _read_flat res2 = self._columns[f].get(cr, self, ids, f, user, context=context, values=res) File "/opt/openerp/server-7/openerp/osv/fields.py", line 1131, in get result = self._fnct(obj, cr, uid, ids, name, self._arg, context) File "/opt/openerp/server-7/openerp/addons/base/ir/ir_rule.py", line 53, in _domain_force_get res[rule.id] = expression.normalize_domain(eval(rule.domain_force, eval_context)) File "/opt/openerp/server-7/openerp/tools/safe_eval.py", line 241, in safe_eval return eval(test_expr(expr, _SAFE_OPCODES, mode=mode), globals_dict, locals_dict) File "", line 1, in <module> AttributeError: 'NoneType' object has no attribute 'id'

How can I solve this? any help please.. thanks