java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.RuntimeException: java.lang.NullPointerException
at com.samczsun.skype4j.internal.SkypeImpl.setRegistrationToken(
at com.samczsun.skype4j.internal.SkypeImpl.subscribe(
at com.mrpowergamerbr.skykaty.SkyKatyApp.loginWith(
at com.mrpowergamerbr.skykaty.view.LoginView$1$

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