IntelliJ: Error: Could not find or load main class, java.lang.ClassNotFoundException

Error:

/Library/Java/JavaVirtualMachines/zulu-11.jdk/Contents/Home/bin/java 
-javaagent:/Applications/IntelliJ IDEA CE.app/Contents/lib/idea_rt.jar=53049:
/Applications/IntelliJ IDEA CE.app/Contents/bin -Dfile.encoding=UTF-8 Scratch

Error: Could not find or load main class HelloWorld
Caused by: java.lang.ClassNotFoundException: HelloWorld

Process finished with exit code 1

Class File:

public class HelloWorld {

    public static void main(String... args) {
        System.out.println("Hello");
    }
}

As you can see the above class does not have any complication issues or syntax errors. There can be multiple reasons that you may get the error, below are some of the solutions that may work for you!

Make sure that the class name is correct.
Go to Menu: Build -> Re-Build Project.
Remove .idea directory from your project and restart IDE.
Go to Files: Invalidate Cache/ Restart...
Check your project has a out folder, if not create one, example: /Users/code2care/IdeaProjects/java-examples/out
Edit Build/Run Configurations and check if you have selected the correct Java class that has a main method.

Fixing Could not find or load main class error

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