GAE部署V2EX一日了，怎么还在索引数据库?如下

Traceback (mos recent call last):
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 511, in __call__
handler.get(*groups)
File "/base/data/home/apps/v2ping/1.345793633376194920/main.py", line 203, in get
for node in qx:
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1786, in __iter__
return self.run()
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 2367, in run
results = _BaseQuery.run(self, **kwargs)
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1770, in run
iterator = raw_query.Run(rpc=rpc)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 1151, in Run
return self._Run(**kwargs)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 1178, in _Run
rpc=rpc)
File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 1211, in _RunInternal
str(exc) + '\nThis query needs this index:\n' + yaml)
NeedIndexError: no matching index found.
This query needs this index:
- kind: Node
properties:
- name: category
- name: topics
direction: desc