HDP 2.1.2 Ambari 1.7.0 App Timeline Server Fails to Start

Hi,

I am using HDP 2.1.2 with Ambari 1.7.0. All services are up and running except App Timeline server. Trying to run start it through Ambari throws:
“Fail: Execution of ‘ls /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid >/dev/null 2>&1 && ps cat /var/run/hadoop-yarn/yarn/yarn-yarn-timelineserver.pid` >/dev/null 2>&1′ returned 1.”

I have set the configuration for HDP 2.1.2
yarn.timeline-service.store-class = org.apache.hadoop.yarn.server.applicationhistoryservice.timeline.LeveldbTimelineStore

The History Server is running fine. Should I use reinstall the cluster with Ambari 1.6.0? Is there a way to remove ATS and not use it?

I can not find any resolution to this, please any help is welcome.