How do I resolve the following?

Exception in thread "main"
org.apache.drill.exec.exception.DrillbitStartupException: Failure while
initializing values in Drillbit.
        at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:70)
        at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:61)
        at org.apache.drill.exec.server.Drillbit.main(Drillbit.java:83)
Caused by: java.lang.IllegalArgumentException: Invalid namespace: /drill
        at
org.apache.curator.framework.imps.NamespaceImpl.<init>(NamespaceImpl.java:41)
        at
org.apache.curator.framework.imps.CuratorFrameworkImpl.<init>(CuratorFrameworkImpl.java:148)
        at
org.apache.curator.framework.CuratorFrameworkFactory$Builder.build(CuratorFrameworkFactory.java:122)
        at
org.apache.drill.exec.coord.zk.ZKClusterCoordinator.<init>(ZKClusterCoordinator.java:72)
        at
org.apache.drill.exec.coord.zk.ZKClusterCoordinator.<init>(ZKClusterCoordinator.java:64)
        at org.apache.drill.exec.server.Drillbit.<init>(Drillbit.java:115)
        at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:68)
        ... 2 more

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