在运行网上的JBPM请假例子时候，出现下面错误

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在运行网上的JBPM请假例子时候，出现下面错误5

如题，在运行请假示例时候，JUnit报下面错误，哪位老大能帮我处理下啊，我是刚刚开始学习JBPM的：

org.jbpm.graph.def.DelegationException
at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:382)
at org.jbpm.graph.def.GraphElement.raiseException(GraphElement.java:373)
at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:276)
at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:215)
at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:185)
at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:169)
at org.jbpm.graph.def.Transition.take(Transition.java:138)
at org.jbpm.graph.def.Node.leave(Node.java:393)
at org.jbpm.graph.node.StartState.leave(StartState.java:70)
at org.jbpm.graph.exe.Token.signal(Token.java:192)
at org.jbpm.graph.exe.Token.signal(Token.java:140)
at org.jbpm.graph.exe.ProcessInstance.signal(ProcessInstance.java:270)
at com.sample.SimpleProcessTest.testSimpleProcess(SimpleProcessTest.java:32)
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 junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
Caused by: java.lang.NullPointerException
at org.jbpm.graph.def.Action.execute(Action.java:122)
at org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:259)
... 28 more

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