TimedObject in Stateless SessionBean

I have a bean that is a Stateless Session Bean and a TimedObject.
When I do the deploy and undeploy of my application appears this error:

Code:

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19:22:29,030 INFO  [ProxyFactory] Bound EJB Home 'UploadEngine' to jndi 'ejb/UploadEngineHome'
19:22:29,233 INFO  [uploadengine] UploadEngineBean::setSessionContext()
19:22:29,233 INFO  [uploadengine] UploadEngineBean::ejbCreate()
19:22:29,233 INFO  [uploadengine] UploadEngineBean::makeDBControlConnection
19:22:29,233 INFO  [uploadengine] UploadEngineBean::setSessionContext()
19:22:29,233 INFO  [uploadengine] UploadEngineBean::ejbCreate()
19:22:29,233 INFO  [uploadengine] UploadEngineBean::makeDBControlConnection
19:22:29,280 INFO  [uploadengine] UploadEngineBean::setSessionContext()
19:22:29,280 INFO  [uploadengine] UploadEngineBean::ejbCreate()
19:22:29,280 INFO  [uploadengine] UploadEngineBean::makeDBControlConnection
19:22:29,326 INFO  [uploadengine] UploadEngineBean::setSessionContext()
19:22:29,326 INFO  [uploadengine] UploadEngineBean::ejbCreate()
19:22:29,326 INFO  [uploadengine] UploadEngineBean::makeDBControlConnection

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what is this?

You have to write this code:

<timer-persistence> false </timer-persistence> in the bean descriptor

peter is right
it's a bug of JBoss