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 after 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.