NotSerializableException w/ ScheduleBackupConfiguration?

Am seeing a lot of these in the logs after upgrading to 2.0b4:

java.lang.RuntimeException: com.atlassian.bamboo.configuration.ScheduleBackupConfiguration
at org.apache.activemq.command.ActiveMQObjectMessage.storeContent(ActiveMQObjectMessage.java:102)
at org.apache.activemq.command.ActiveMQObjectMessage.setObject(ActiveMQObjectMessage.java:144)
at org.apache.activemq.ActiveMQSession.createObjectMessage(ActiveMQSession.java:361)
at org.jencks.amqpool.PooledSession.createObjectMessage(PooledSession.java:151)
at org.springframework.jms.support.converter.SimpleMessageConverter.createMessageForSerializable(SimpleMessageConverter.java:173)
at org.springframework.jms.support.converter.SimpleMessageConverter.toMessage(SimpleMessageConverter.java:81)
at org.springframework.jms.core.JmsTemplate$6.createMessage(JmsTemplate.java:590)
at org.springframework.jms.core.JmsTemplate.doSend(JmsTemplate.java:509)
at org.springframework.jms.core.JmsTemplate$2.doInJms(JmsTemplate.java:479)
at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:430)
at org.springframework.jms.core.JmsTemplate.send(JmsTemplate.java:477)
at org.springframework.jms.core.JmsTemplate.convertAndSend(JmsTemplate.java:588)
at org.springframework.jms.core.JmsTemplate.convertAndSend(JmsTemplate.java:576)
at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.addToJmsQueue(BuildQueueManagerImpl.java:359)
at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.addBuildToQueue(BuildQueueManagerImpl.java:89)
at com.atlassian.bamboo.v2.build.queue.BuildTriggeredListener.handleEvent(BuildTriggeredListener.java:21)
at com.atlassian.event.DefaultEventManager$2.run(DefaultEventManager.java:202)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$1.run(NamedThreadFactory.java:32)
at edu.emory.mathcs.backport.java.util.concurrent.helpers.ThreadHelpers$1.run(ThreadHelpers.java:34)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.NotSerializableException: com.atlassian.bamboo.configuration.ScheduleBackupConfiguration
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at org.apache.activemq.command.ActiveMQObjectMessage.storeContent(ActiveMQObjectMessage.java:96)
... 21 more

It seems to be preventing plans from starting a build. Prior to one particular listing of that exception in the log is:

2008-03-10 19:38:17,567 INFO [pool-22-thread-1] [InitialBuildListener] Change detection found 21 changes
2008-03-10 19:38:17,573 INFO [pool-22-thread-1] [DefaultBuildExecutionManager] LOCK: finishProcess PlanKey: LWS-DEF Thread:pool-22-thread-1
2008-03-10 19:38:17,573 INFO [pool-22-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.build.DefaultBuildExecutionManager.finishProcess(DefaultBuildExecutionManager.java:98)
2008-03-10 19:38:17,573 INFO [pool-22-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.trigger.ChangeDetectionListener.handleEvent(ChangeDetectionListener.java:116)
2008-03-10 19:38:17,573 INFO [pool-22-thread-1] [DefaultBuildExecutionManager] at com.atlassian.event.DefaultEventManager$2.run(DefaultEventManager.java:202)
2008-03-10 19:38:17,573 INFO [pool-22-thread-1] [DefaultBuildExecutionManager] ....

2008-03-10 19:38:17,576 WARN [pool-23-thread-1] [BuildQueueManagerImpl] Attempting to queue LWS-DEF with LWS-DEF-4651.
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] LOCK: waitToProcess PlanKey: LWS-DEF Thread:pool-23-thread-1
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.build.DefaultBuildExecutionManager.waitToProcess(DefaultBuildExecutionManager.java:62)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.addBuildToQueue(BuildQueueManagerImpl.java:76)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildTriggeredListener.handleEvent(BuildTriggeredListener.java:21)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.event.DefaultEventManager$2.run(DefaultEventManager.java:202)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] ....

2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] LOCK: WAIT ACQUIRED PlanKey: LWS-DEF Thread:pool-23-thread-1
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.build.DefaultBuildExecutionManager.waitToProcess(DefaultBuildExecutionManager.java:82)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.addBuildToQueue(BuildQueueManagerImpl.java:76)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildTriggeredListener.handleEvent(BuildTriggeredListener.java:21)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.event.DefaultEventManager$2.run(DefaultEventManager.java:202)
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] ....

2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [BuildQueueManagerImpl] Attempting to add to build queue...
2008-03-10 19:38:17,577 INFO [pool-23-thread-1] [BuildQueueManagerImpl] Obtained write lock to add to build queue
2008-03-10 19:38:17,580 INFO [pool-23-thread-1] [LocalAgentManagerImpl] Trying to match requirements... com.atlassian.bamboo.v2.build.agent.capability.RequirementSetImpl@bc71af[[system.builder.mvn2.maven LIKE .*, system.jdk.1.5.0 32bit LIKE .*, bamboo.1.2.queue LIKE ALLOW_ANY_BUILDS|\QDefault Queue\E]]
2008-03-10 19:38:17,582 INFO [pool-23-thread-1] [LocalAgentManagerImpl] Added agent Default Queue
2008-03-10 19:38:17,582 INFO [pool-23-thread-1] [LocalAgentManagerImpl] Rejected agent Compile Queue
2008-03-10 19:38:17,583 INFO [pool-23-thread-1] [LocalAgentManagerImpl] Rejected agent Ajanta Queue
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] LOCK: finishProcess PlanKey: LWS-DEF Thread:pool-23-thread-1
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.build.DefaultBuildExecutionManager.finishProcess(DefaultBuildExecutionManager.java:98)
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.build.DefaultBuildExecutionManager.finishBuild(DefaultBuildExecutionManager.java:148)
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildQueueManagerImpl.addBuildToQueue(BuildQueueManagerImpl.java:96)
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.bamboo.v2.build.queue.BuildTriggeredListener.handleEvent(BuildTriggeredListener.java:21)
2008-03-10 19:38:17,674 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] at com.atlassian.event.DefaultEventManager$2.run(DefaultEventManager.java:202)
2008-03-10 19:38:17,675 INFO [pool-23-thread-1] [DefaultBuildExecutionManager] ....