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java.lang.NoClassDefFoundError: com.android.uiautomator.core.Configurator	at io.appium.android.bootstrap.AndroidElement.(AndroidElement.java:26)	at io.appium.android.bootstrap.AndroidElementsHash.addElement(AndroidElementsHash.java:47)	at io.appium.android.bootstrap.AndroidElementsHash.getElement(AndroidElementsHash.java:89)	at io.appium.android.bootstrap.handler.Find.fetchElement(Find.java:150)	at io.appium.android.bootstrap.handler.Find.execute(Find.java:90)	at io.appium.android.bootstrap.AndroidCommandExecutor.execute(AndroidCommandExecutor.java:64)	at io.appium.android.bootstrap.SocketServer.runCommand(SocketServer.java:168)	at io.appium.android.bootstrap.SocketServer.handleClientData(SocketServer.java:89)	at io.appium.android.bootstrap.SocketServer.listenForever(SocketServer.java:133)	at io.appium.android.bootstrap.Bootstrap.testRunServer(Bootstrap.java:16)	at java.lang.reflect.Method.invokeNative(Native Method)	at com.android.uiautomator.testrunner.UiAutomatorTestRunner.start(UiAutomatorTestRunner.java:144)	at com.android.uiautomator.testrunner.UiAutomatorTestRunner.run(UiAutomatorTestRunner.java:87)	at com.android.commands.uiautomator.RunTestCommand.run(RunTestCommand.java:90)	at com.android.commands.uiautomator.Launcher.main(Launcher.java:83)	at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)	at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:235)	at dalvik.system.NativeStart.main(Native Method)