wp_enqueue_script not working in sub-domani

I’ve created a sub-domain and installed WordPress. The following code is in the functions.php file:

function add_jqwidgets() {
    wp_register_script('tables', get_template_directory_uri() . '/js/tables.js', array('jquery'),null, false);
    wp_enqueue_script('tables');
}

I’m getting the following error:

jquery.min.js:2 jQuery.Deferred exception: createTable is not defined ReferenceError: createTable is not defined
at HTMLDocument.<anonymous>

I’ve been hacking away at this for days. Any help would be appreciated.
Bob K.