Petals SE Activiti

org.ow2.petals.activitibpmn.incoming.operation.exception.OperationProcessingException: An error occurs processing the operation 'xxxxxxxxxx': The just created process instance 'y' is not found for the process definition 'zzzzzzzzzzzz:t:v'.
	at org.ow2.petals.activitibpmn.incoming.operation.StartEventOperation.doExecute(StartEventOperation.java:137)
	at org.ow2.petals.activitibpmn.incoming.operation.ActivitiOperation.execute(ActivitiOperation.java:280)
	at org.ow2.petals.activitibpmn.incoming.ActivitiJBIListener.onJBIMessage(ActivitiJBIListener.java:118)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.processInOutAsProvider(MessageExchangeProcessor.java:759)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.processAsProvider(MessageExchangeProcessor.java:490)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.process(MessageExchangeProcessor.java:339)
	at org.ow2.petals.component.framework.process.MessageExchangeProcessor.run(MessageExchangeProcessor.java:256)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
2015/05/26 14:54:32,410 GMT+0200 FINE [org.ow2.petals.component.framework.componentUnderTestWithDefaultConfiguration] : End ActivitiJBIListener.onJBIMessage()