getting error in executor java.io.IOException: Could not find (.*log4j.*)|(.*slf4j.*) jar

[joestein]

2015-08-04 18:34:16,104 [Exhibitor] INFO org.mortbay.log - jetty-1.5.5
2015-08-04 18:34:16,537 [Exhibitor] INFO org.mortbay.log - Started [email protected]:31000
2015-08-04 18:35:15,786 [ActivityQueue-0] INFO com.netflix.exhibitor.core.activity.ActivityLog - State: down
2015-08-04 18:35:15,792 [ActivityQueue-0] INFO com.netflix.exhibitor.core.activity.ActivityLog - Attempting to stop instance
2015-08-04 18:35:15,792 [ActivityQueue-0] INFO com.netflix.exhibitor.core.activity.ActivityLog - Attempting to start/restart ZooKeeper
2015-08-04 18:35:15,997 [ActivityQueue-0] INFO com.netflix.exhibitor.core.activity.ActivityLog - jps didn't find instance - assuming ZK is not running
2015-08-04 18:35:15,999 [ActivityQueue-0] ERROR com.netflix.exhibitor.core.activity.ActivityLog - Monitoring instance
java.io.IOException: Could not find (.log4j.)|(.slf4j.) jar
at com.netflix.exhibitor.core.processes.Details.findJar(Details.java:145)
at com.netflix.exhibitor.core.processes.Details.(Details.java:57)
at com.netflix.exhibitor.core.processes.StandardProcessOperations.startInstance(StandardProcessOperations.java:105)
at com.netflix.exhibitor.core.state.KillRunningInstance.completed(KillRunningInstance.java:41)
at com.netflix.exhibitor.core.activity.ActivityQueue$1.run(ActivityQueue.java:127)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)