Why am I getting this exception in GAE

Question

I just tested and redistributed my application to a test instance, and it worked fine, then I changed the application identifier and redistributed it to my instance, and I had an indexing problem. How can I avoid this in the future? I did my best to check it out and it worked fine.

Uncaught exception from servlet
com.google.appengine.api.datastore.DatastoreNeedIndexException: no matching index found..      <datastore-index kind="Article" ancestor="false" source="manual">
    <property name="tags" direction="asc"/>
    <property name="created" direction="asc"/>
</datastore-index>
at com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java:40)
at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall(DatastoreApiHelper.java:67)

The admin console says that this is the "Create" index. He said that already 20 minutes! How long will it take?

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Answer 4

Check the index.yaml file and make sure that the corresponding indexes are listed there, etc.