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    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

java.lang.NumberFormatException: null at java.lang.Integer.parseInt( at java.lang.Integer.parseInt( at com.appium.manager.AppiumParallelTest.checkSelendroid( at com.appium.manager.AppiumParallelTest.androidNative( at com.appium.manager.AppiumParallelTest.startingServerInstance( at com.appium.manager.AppiumParallelTest.startAppiumServerInParallel( at com.cucumber.listener.ExtentCucumberFormatter.startOfScenarioLifeCycle( at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke( at sun.reflect.DelegatingMethodAccessorImpl.invoke( at java.lang.reflect.Method.invoke(