eo_get_the_start returning null

Hello,
it is a frequent issue but I can’t find a solution yet.
For a featured event I’m trying to display the info in the same way as other posts.
I’m using this code:

<div class="actividad" style="background-color:<?php echo $cat_color;?>">
								<h2><a href="<?php the_permalink(); ?>" title="ir a <?php the_title() ?>">
										<?php the_title(); ?>
								</a></h2>
								<div class="clear">&nbsp;</div>
							</div>
							<div class="clear">&nbsp;</div>
							<div class="horario">
											<div class="dia">
												<a href="<?php echo eo_get_event_archive_link( eo_get_the_start($format_date, $post->ID,null,$post->occurrence_id)); ?>" title="ir a los eventos del <?php eo_get_the_start($format_date, $post->ID,null,$post->occurrence_id); ?>" ><?php eo_get_the_start($format_date, $post->ID,null,$post->occurrence_id); ?><br/> <?php eo_the_start($format_date, $post->ID,null,$post->occurrence_id); ?></a>
											</div>

It displays the_title so a current post exists.
The time does not appear, the same code for other events displays the time correctly, even with the format only as parameter of eo_get_the_start().
Any suggestion will be appreciated,
A.

https://wordpress.org/plugins/event-organiser/