I had https://secure.phabricator.com/w/changelog/2016.26/ version and upgraded to https://secure.phabricator.com/w/changelog/2017.20/. After upgrade I saw this error on one of the Dashboard panels:
```
Exception: Query "need" is unknown to application search engine "PhabricatorCommitSearchEngine"!
```
Turned out, that default saved query list returned by `\PhabricatorCommitSearchEngine::buildSavedQueryFromBuiltin` method was greatly reduced and on affected panel the `need` query was used, which is no longer present.
Built-in saved queries before upgrade:
* all
* open
* need
* authored
* problem
Built-in saved queries before upgrade:
* all
* active
* authored
* audited
I guess the `open`, `need` and `problem` queries should be migrated to use `active` query or removed saved queries could be brought back.