As an example, you'll get this mistake if you try to operate your method with java HelloWorldApp.course as opposed to java HelloWorldApp. Try to remember, the argument could be the title of the class Also, Java is an object-oriented programming language Item-oriented programming is for the core of Java. Mainly https://eduardowfcni.blogolize.com/a-simple-key-for-hire-sameone-to-do-java-assignment-unveiled-65571399