%s is not working

treehouse:~/workspace$ javac Introductions.java
Picked up JAVA_TOOL_OPTIONS: -Xmx128m
Picked up _JAVA_OPTIONS: -Xmx128m
^[[A^[[Atreehouse:~/workspace$ java Introductions
Picked up JAVA_TOOL_OPTIONS: -Xmx128m
Picked up _JAVA_OPTIONS: -Xmx128m
Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '%s'
at java.util.Formatter.format(Formatter.java:2519)
at java.util.Formatter.format(Formatter.java:2455)
at java.io.Console.format(Console.java:170)
at java.io.Console.printf(Console.java:209)
at Introductions.main(Introductions.java:10)

This is my result. This is what's typed in the code:

import java.io.Console;

public class Introductions {

public static void main(String[] args) {
    Console console = System.console();
    // Welcome to the Introductions program!  Your code goes below here
    String firstName = "Amber";
    //thisIsAnExampleOfCamelCasing
    console.printf("Hello, my name is %s\n, firstName");
    console.printf("%s is learning how to write java\n, firstName");        

} }