当我尝试继承外部 id web.assets_backend odoo 时说找不到外部 id，这是错误日志：
Traceback (most recent call last):
File "/opt/odoo/sources/odoo/odoo/tools/cache.py", line 85, in lookup
r = d[key]
File "/opt/odoo/sources/odoo/odoo/tools/func.py", line 71, in wrapper
return func(self, *args, **kwargs)
File "/opt/odoo/sources/odoo/odoo/tools/lru.py", line 34, in __getitem__
a = self.d[obj]
KeyError: ('ir.model.data', <function IrModelData._xmlid_lookup at 0x7fb3865beaf0>, 'web.assets_backend')
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/opt/odoo/sources/odoo/odoo/tools/convert.py", line 680, in _tag_root
f(rec)
File "/opt/odoo/sources/odoo/odoo/tools/convert.py", line 658, in _tag_template
return self._tag_record(record)
File "/opt/odoo/sources/odoo/odoo/tools/convert.py", line 567, in …