Hello, I am trying to run the following code but getting the error above.

Please help.

import java.io.*;

public class StringBuilder {

    public StringBuilder() {

        super();

    }

    public static void main(String args[])

    {

            // creates empty builder, capacity 16

            StringBuilder sb = new StringBuilder();

            // adds 9 character string at beginning

            sb.append("Greetings");

    }

}