Hey there! This is actually a common error when starting with Java, the JAVA_HOME variable doesn’t appear to be set. Usually this variable is set automatically when installing the Java Development Kit, but you can set it manually if you’re sure you’ve installed the JDK already. I’m also realizing now that I don’t think I mentioned this in the tutorial despite how important it is!

If you’re willing to, maybe try installing the JDK (if you don’t have it) as found on Oracle’s website here: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Hopefully that helps, but if not please let me know and hopefully we can figure it out! Either way, sorry for the mistake! I’ll try and find a minute to add this to the guide too!