tabber tabs error in debug mode

replace line 31 with:

define( 'TABBER_TABS_DIR', plugins_url('tabber-tabs-widget/'));

Presume you also get error on line 125?

replace line 125 with:

if (isset($widgetcolums[$index])) return true;

on one more note for the errors to correct the “Notice: wp_enqueue_script was called incorrectly” error message

Replace with:

if ( !is_admin() ) {
    add_action('wp_enqueue_scripts', 'enqueue_scripts');
}   

function enqueue_scripts() {
    wp_deregister_script('tabbertabs');
    wp_register_script('tabbertabs', TABBER_TABS_DIR . 'js/tabber-minimized.js');
    wp_enqueue_script('tabbertabs');
};