Try this in your functions.php
function your_widget(){
register_sidebar(array(
'name' => 'Footer Column 2',
'id' => 'footer-column-2', // I also added the ID but doesn't work
'before_widget' => '<div id="%1$s" class="omc-footer-widget %2$s">',
'after_widget' => '</div>',
'before_title' => '<h4>',
'after_title' => '</h4>'
));
}
add_action( 'widgets_init', 'your_widget' );
Call in footer.php with the ID.
<?php if ( is_active_sidebar( 'footer-column-2' ) ) : ?>
<div class="omc-footer-widget-column">
<?php dynamic_sidebar( 'footer-column-2' ); ?>
</div><!--- /second-footer-column -->
<?php endif; ?>