[jboss-user] [jBPM] - Human Task Not Working

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"Human Task Not Working"

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I created my JBPM project with some human task  but when i try to run it ,I get this message,

0
05/07 11:17:53,531[main] ERROR workitem.wsht.GenericHTWorkItemHandler.executeWorkItem  - 
Thu Jul 05 11:17:53 WAT 2012: Error when creating task on task server for work item id 1. Error reported by task server: Task operation request timed out
java.lang.RuntimeException: Task operation request timed out
at  org.jbpm.task.service.SyncTaskServiceWrapper.addTask(SyncTaskServiceWrapper.java:118)at  org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler.executeWorkItem(GenericHTWorkItemHandler.java:145)at  org.drools.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:70)at  org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:105)at  org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)at  org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:205)at  org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:164)at  org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)at  org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)at  org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:124)at  org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)at  org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:188)at  org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:303)at  org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:168)at  org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:138)at  org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1082)at  org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:320)at com.principal.PrincipalProcess.main(PrincipalProcess.java:30)
Process Started..........

I have tried the Evaluation Example a million times, in that example also i am facing the same issue...sometimes it works for the first time after installing jbpm but at the next instant it crashes with the same error.Please give a permanent solution to this query as i have reffered the previous discussions with the same topic,but didn't found any useful solution.Quick resolution is appreciated.
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