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java.lang.NullPointerException: 	at org.apache.tajo.LocalTajoTestingUtility.execute(LocalTajoTestingUtility.java:99)	at org.apache.tajo.TpchTestBase.execute(TpchTestBase.java:102)	at org.apache.tajo.QueryTestCaseBase.executeQuery(QueryTestCaseBase.java:197)	at org.apache.tajo.QueryTestCaseBase.executeQuery(QueryTestCaseBase.java:183)	at org.apache.tajo.benchmark.TestTPCH.testQ1OrderBy(TestTPCH.java:32)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)	at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:47)	at org.junit.rules.RunRules.evaluate(RunRules.java:18)	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)	at org.junit.runners.ParentRunner.run(ParentRunner.java:300)	at org.junit.runner.JUnitCore.run(JUnitCore.java:157)	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:77)	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:195)	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:63)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)