java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at SeleniumAutomation.GoogleSignupAutomation.GmailSignupAutomation.tearDown(GmailSignupAutomation.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:100)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:515)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:216)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:143)
at org.testng.internal.TestMethodWorker.invokeAfterClassMethods(TestMethodWorker.java:217)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:115)
at org.testng.TestRunner.privateRun(TestRunner.java:746)
at org.testng.TestRunner.run(TestRunner.java:600)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
at org.testng.SuiteRunner.run(SuiteRunner.java:268)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1264)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1189)
at org.testng.TestNG.runSuites(TestNG.java:1104)
at org.testng.TestNG.run(TestNG.java:1076)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:152)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:57)

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