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java.lang.NullPointerException: 	at com.appium.manager.AppiumParallelTest.onTestStart(AppiumParallelTest.java:500)	at org.testng.internal.Invoker.runTestListeners(Invoker.java:1904)	at org.testng.internal.Invoker.runTestListeners(Invoker.java:1879)	at org.testng.internal.Invoker.invokeMethod(Invoker.java:685)	at org.testng.internal.Invoker.retryFailed(Invoker.java:1049)	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1254)	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)