Why this code not running pls

Question

package csc;
public class Main {
public static void main(String[] args) {
System.out.println("Hello-World");
}
}

Answer 1

Sololearn code playground has no idea about what "package csc;" is that's why it throwing an error.

Read about java package.

Answer 2

Warning: File ./Main.class does not contain class Main
Error: Could not find or load main class Main
Caused by: java.lang.NoClassDefFoundError: csc/Main (wrong name: Main)

As you can see by your error, you're trying to access a package that doesn't exist on their server. Remove that line and you'll be fine.