Fatal Error Exception initialising class.app.php
No sentinel server available for autodiscovery.

#0 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(455): Predis\Connection\Aggregate\SentinelReplication->getSentinelConnection()
#1 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(480): Predis\Connection\Aggregate\SentinelReplication->getSlaves()
#2 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(495): Predis\Connection\Aggregate\SentinelReplication->pickSlave()
#3 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(536): Predis\Connection\Aggregate\SentinelReplication->getConnectionInternal(Object(Predis\Command\StringGet))
#4 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(658): Predis\Connection\Aggregate\SentinelReplication->getConnection(Object(Predis\Command\StringGet))
#5 /srv/hydra/lib/vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php(698): Predis\Connection\Aggregate\SentinelReplication->retryCommandOnFailure(Object(Predis\Command\StringGet), 'executeCommand')
#6 /srv/hydra/lib/vendor/predis/predis/src/Client.php(331): Predis\Connection\Aggregate\SentinelReplication->executeCommand(Object(Predis\Command\StringGet))
#7 /srv/hydra/lib/vendor/predis/predis/src/Client.php(314): Predis\Client->executeCommand(Object(Predis\Command\StringGet))
#8 /srv/hydra/lib/vendor/predis/predis/src/Session/Handler.php(97): Predis\Client->__call('get', Array)
#9 [internal function]: Predis\Session\Handler->read('siv55997hhsfm4c...')
#10 /srv/hydra/application/class.app.php(253): session_start()
#11 /srv/hydra/public_html/index.php(15): app->__construct()
#12 {main}