Unable to start AEM with errors like mentioned in the subject and repository service unregistering

 org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate@395786be with name Registered Service.351 and config SINGLE.
10.05.2017 10:45:26.521 *ERROR* [pool-6-thread-3] org.apache.sling.commons.scheduler.impl.QuartzScheduler No discovery available, therefore not executing job org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate@395786be with name Registered Service.351 and config SINGLE.
10.05.2017 10:45:31.521 *ERROR* [pool-6-thread-5] org.apache.sling.commons.scheduler.impl.QuartzScheduler No discovery available, therefore not executing job org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate@395786be with name Registered Service.351 and config SINGLE.
10.05.2017 10:45:36.520 *ERROR* [pool-6-thread-3] org.apache.sling.commons.scheduler.impl.QuartzScheduler No discovery available, therefore not executing job org.apache.jackrabbit.oak.plugins.index.AsyncIndexUpdate@395786be with name Registered Service.351 and config SINGLE.