java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:705)
at org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:670)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at servletunit.struts.MockStrutsTestCase.getActionServlet(MockStrutsTestCase.java:326)
at servletunit.struts.MockStrutsTestCase.tearDown(MockStrutsTestCase.java:130)
at junit.framework.TestCase.runBare(TestCase.java:130)
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 junit.textui.TestRunner.doRun(TestRunner.java:116)
at com.intellij.rt.execution.junit2.IdeaJUnitAgent.doRun(IdeaJUnitAgent.java:57)
at junit.textui.TestRunner.start(TestRunner.java:172)
at com.intellij.rt.execution.junit2.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:97)
at com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:31)
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:324)

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