jbpm流程定义文件出错（急需回复）

Exception in thread "main" org.jbpm.jpdl.JpdlException: [[ERROR] cvc-complex-type.2.4.a: Invalid content was found starting with element 'description'. One of '{"urn:jbpm.org:jpdl-3.1":action, "urn:jbpm.org:jpdl-3.1":script, "urn:jbpm.org:jpdl-3.1":create-timer, "urn:jbpm.org:jpdl-3.1":cancel-timer, "urn:jbpm.org:jpdl-3.1":exception-handler}' is expected. at file:/D:/work/jbpm-demo1/bin/helloworld/processdefinition.xml line 30, [ERROR] cvc-complex-type.2.4.a: Invalid content was found starting with element 'condition'. One of '{"urn:jbpm.org:jpdl-3.1":action, "urn:jbpm.org:jpdl-3.1":script, "urn:jbpm.org:jpdl-3.1":create-timer, "urn:jbpm.org:jpdl-3.1":cancel-timer, "urn:jbpm.org:jpdl-3.1":exception-handler}' is expected. at file:/D:/work/jbpm-demo1/bin/helloworld/processdefinition.xml line 35, [WARNING] swimlane '' does not have an assignment, [WARNING] swimlane '' does not have an assignment]
at org.jbpm.jpdl.xml.JpdlXmlReader.readProcessDefinition(JpdlXmlReader.java:173)
at org.jbpm.graph.def.ProcessDefinition.parseXmlResource(ProcessDefinition.java:165)
at test.TestHelloWorld.main(TestHelloWorld.java:10)不知道有哪位遇到个这样的错误，知道请告知下