title: Get error - "class wasn't found" when tryinng to run Java class
body: <p>When I run my program a prompt appears saying, "firstgame.FirstGame class wasn't found in FirstGame project.</p>
  
  <pre><code>public class FirstGame {
  
      public static void main(String args[]) {
  
          System.out.println("Hello World");
  
      }
  
  }
  </code></pre>