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java.lang.NullPointerException: 	at io.knovo.factual.TestUnitFactualService.tearDown(TestUnitFactualService.java:44)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:37)	at org.junit.runners.ParentRunner.run(ParentRunner.java:292)	at org.mockito.internal.runners.JUnit45AndHigherRunnerImpl.run(JUnit45AndHigherRunnerImpl.java:37)	at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:62)	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)