I am new at Twitch4J developing in Java

API Migration
11

you probalby know what this error means?

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "com.github.twitch4j.helix.TwitchHelix.getUsers(String, java.util.List, java.util.List)" because the return value of "com.github.twitch4j.IClientHelper.getTwitchHelix()" is null
	at com.github.twitch4j.IClientHelper.enableStreamEventListener(IClientHelper.java:103)
	at de.bot.Main.<init>(Main.java:67)
	at de.bot.Main.main(Main.java:41)