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java.lang.NullPointerException: null	at tachyon.master.LocalTachyonCluster.stopTFS(LocalTachyonCluster.java:130)	at tachyon.master.AbstractLocalTachyonCluster.stop(AbstractLocalTachyonCluster.java:283)	at tachyon.master.LocalTachyonCluster.stop(LocalTachyonCluster.java:146)	at tachyon.LocalTachyonClusterResource$1.evaluate(LocalTachyonClusterResource.java:193)	at org.junit.rules.RunRules.evaluate(RunRules.java:20)	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray2(ReflectionUtils.java:208)	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:158)	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:86)	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:95)