thatposhgirl on "Can't get color picker to work"

I'm trying to use the color picker in an admin menu for my plugin. I've followed the directs exactly as they appear here: http://make.wordpress.org/core/2012/11/30/new-color-picker-in-wp-3-5/

I've verified that my-script.js is linked on the page and url is correct.

I have this in my plugin's main .php file:

add_action( 'admin_enqueue_scripts', 'mw_enqueue_color_picker' );
function mw_enqueue_color_picker( $hook_suffix ) {
    // first check that $hook_suffix is appropriate for your admin page
    wp_enqueue_style( 'wp-color-picker' );
    wp_enqueue_script( 'my-script-handle', ECBS_JS_URL . 'my-script.js', array( 'wp-color-picker' ), false, true );
}

This is my-script.js:

var $j = jQuery.noConflict();
jQuery(document).ready(function($j){
    $j('.my-color-field').wpColorPicker();
});

My input tags that I want to use the color picker have the attribute class="my-color-field".

Nothing happens at all. No errors, nothing.

Any advice would be appreciated.