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java.lang.ClassCastException: com.cenqua.crucible.notification.Notification cannot be cast to java.lang.Comparable	at java.util.TreeMap.compare(Unknown Source)	at java.util.TreeMap.put(Unknown Source)	at java.util.TreeSet.add(Unknown Source)	at java.util.AbstractCollection.addAll(Unknown Source)	at java.util.TreeSet.addAll(Unknown Source)	at java.util.TreeSet.(Unknown Source)	at com.cenqua.crucible.notification.batch.creators.PluginBatchCreator.getEmailSegment(PluginBatchCreator.java:50)	at com.cenqua.crucible.notification.DefaultNotificationManager.getBatchMessage(DefaultNotificationManager.java:556)	at com.cenqua.crucible.notification.DefaultNotificationManager.processNotification(DefaultNotificationManager.java:506)	at com.cenqua.crucible.notification.DefaultNotificationManager.processNotifications(DefaultNotificationManager.java:362)	at com.cenqua.crucible.notification.DefaultNotificationManager.access$200(DefaultNotificationManager.java:78)	at com.cenqua.crucible.notification.DefaultNotificationManager$6.run(DefaultNotificationManager.java:289)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)	at java.util.concurrent.FutureTask.runAndReset(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)