i think this is the stack trace...
WARN: Exception: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.commons.beanutils.BeanMap.get(BeanMap.java:390)
at org.red5.io.amf.Output.writeObject(Output.java:357)
at org.red5.io.object.Serializer.writeObjectType(Serializer.java:300)
at org.red5.io.object.Serializer.writeComplex(Serializer.java:140)
at org.red5.io.object.Serializer.serialize(Serializer.java:86)
at org.red5.io.amf.Output.writeObject(Output.java:357)
at org.red5.io.object.Serializer.writeObjectType(Serializer.java:300)
at org.red5.io.object.Serializer.writeComplex(Serializer.java:140)
at org.red5.io.object.Serializer.serialize(Serializer.java:86)
at org.red5.io.amf.Output.writeObject(Output.java:357)
at org.red5.io.object.Serializer.writeObjectType(Serializer.java:300)
at org.red5.io.object.Serializer.writeComplex(Serializer.java:140)
at org.red5.io.object.Serializer.serialize(Serializer.java:86)
at org.red5.io.object.Serializer.serialize(Serializer.java:63)
at org.red5.io.amf.Output.writeMap(Output.java:210)
at org.red5.io.object.Serializer.writeObjectType(Serializer.java:296)
at org.red5.io.object.Serializer.writeComplex(Serializer.java:140)
at org.red5.io.object.Serializer.serialize(Serializer.java:86)
at org.red5.io.object.Serializer.serialize(Serializer.java:63)
at org.red5.server.PersistableAttributeStore.serialize(PersistableAttributeStore.java:177)
at org.red5.server.persistence.FilePersistence.saveObject(FilePersistence.java:437)
at org.red5.server.persistence.FilePersistenceThread.run(FilePersistenceThread.java:143)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:181)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:205)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.nio.BufferUnderflowException
at org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1937)
at org.apache.mina.core.buffer.AbstractIoBuffer.getObject(AbstractIoBuffer.java:1927)