These methods are repeated every couple of seconds in the log.

Oct 30, 2009 11:42:32 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@66db4e
failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.OverallLoadStatistics.computeIdleExecutors(OverallLoadStatistics.java:56)
at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:159)
at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:53)
at
hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:215)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Oct 30, 2009 11:42:35 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.model.LoadStatistics$LoadStatisticsUpdater@ca86fd failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.LoadStatistics$LoadStatisticsUpdater.doRun(LoadStatistics.java:214)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Oct 30, 2009 11:42:42 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@66db4e
failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.OverallLoadStatistics.computeIdleExecutors(OverallLoadStatistics.java:56)
at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:159)
at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:53)
at
hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:215)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Oct 30, 2009 11:42:45 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.model.LoadStatistics$LoadStatisticsUpdater@ca86fd failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.LoadStatistics$LoadStatisticsUpdater.doRun(LoadStatistics.java:214)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Oct 30, 2009 11:42:52 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@66db4e
failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.OverallLoadStatistics.computeIdleExecutors(OverallLoadStatistics.java:56)
at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:159)
at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:53)
at
hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:215)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Oct 30, 2009 11:42:55 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.model.LoadStatistics$LoadStatisticsUpdater@ca86fd failed
java.lang.NoClassDefFoundError
at hudson.model.Hudson.getComputer(Hudson.java:1271)
at
hudson.model.LoadStatistics$LoadStatisticsUpdater.doRun(LoadStatistics.java:214)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)