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java.lang.NullPointerException: 	at Page.onNumberItemClicked(UserPage.java:124)	at PageTest.testOnNumberItemClicked(UserPageTest.java:131)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)	at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)	at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)	at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)	at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)	at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)	at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)	at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)	at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)	at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)