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java.lang.NullPointerException: 	at servletunit.struts.CactusStrutsTestCase.getActionServlet(CactusStrutsTestCase.java:415)	at servletunit.struts.CactusStrutsTestCase.actionPerform(CactusStrutsTestCase.java:479)	at isp.apps.pgr.gms.actionsTest.TestPGRStaffNavigation.testNavigateHome(TestPGRStaffNavigation.java:70)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at org.apache.cactus.ServletTestCase.runCactusTest(ServletTestCase.java:295)	at org.apache.cactus.ServletTestCase.runBare(ServletTestCase.java:263)	at org.apache.cactus.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:156)