Hi Emerson,
Besides the previous post some other issues. But first, I managed to do something myself WITHOUT errors 
.
I registered a new sidebar . I can't manage it from the backend in WordPress (theme options), but at this moment, that don't bother me.
However, what I do wonder, how to achieve the following. I want one widget in the new sidebar to have a span3, and the other a span9. Now I use this code in my functions.php but don't now how to achieve my question.
function wpbootstrap_register_footer_copyright_widgets() {
$widget_class = 'span12';
// if (wpbootstrap_get_setting('general_settings', 'display_header_widgets')) {
// $widget_class = 'span' . intval(of_get_option('header_widget_width'));
// }
register_sidebar(array(
'name' => __('Footer copyright widgets area', 'wpbootstrap'),
'id' => 'footer-copyright-widgets',
'description' => __('Appears above the header', 'wpbootstrap'),
'before_widget' => '<div id="%1$s" class="' . $widget_class . ' widget %2$s">',
'after_widget' => '</div>',
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>',
));
}
If you want to see the sidebar live you can see it on caesarsbeauty [dot] nl.
Kind regards,
Willem