Can’t get group of fields to frontend

Hi! I’m having problems trying to get the next code to frontend:

function yourprefix_register_demo_metabox() {
	//INGREDIENTES
	$prefix = 'ingredientes_';
	$cmb_demo = new_cmb2_box( array(
		'id'            => $prefix . 'metabox',
		'title'         => __( 'Receta', 'cmb2' ),
		'object_types'  => array( 'receta', ), // Post type
		// 'show_on_cb' => 'yourprefix_show_if_front_page', // function should return a bool value
		// 'context'    => 'normal',
		//'priority'   => 'high',
		// 'show_names' => true, // Show field names on the left
		// 'cmb_styles' => false, // false to disable the CMB stylesheet
		// 'closed'     => true, // true to keep the metabox closed by default
		// 'classes'    => 'extra-class', // Extra cmb2-wrap classes
		// 'classes_cb' => 'yourprefix_add_some_classes', // Add classes through a callback.
	) );

	$cmb_demo->add_field( array(
		'name'     => __( 'Ingredientes necesarios', 'cmb2' ),
		'desc'     => __( 'Selecciona los ingredientes necesarios', 'cmb2' ),
		'id'       => $prefix . 'lista',
		'type'     => 'taxonomy_multicheck',
		'taxonomy' => 'post_tag', // Taxonomy Slug
		'select_all_button' => false,
		// 'inline'  => true, // Toggles display to inline
	) );

	//PASOS
	$grupo_pasos_id = $cmb_demo->add_field( array(
	    'id'          => 'pasos_grupo',
	    'type'        => 'group',
	    'description' => __( 'Carga los pasos a seguir', 'cmb' ),
	    'options'     => array(
	        'group_title'   => __( 'Paso {#}', 'cmb' ), // since version 1.1.4, {#} gets replaced by row number
	        'add_button'    => __( 'Agregar otro paso', 'cmb' ),
	        'remove_button' => __( 'Eliminar paso', 'cmb' ),
	        'sortable'      => true, // beta
	    ),
	) );
	
	// Id's for group's fields only need to be unique for the group. Prefix is not needed.
	$cmb_demo->add_group_field( $grupo_pasos_id, array(
		'name' => __( 'Describe el paso:', 'cmb2' ),
		// 'desc' => __( 'field description (optional)', 'cmb2' ),
		'id'   => 'descripcion',
		'type' => 'textarea_small',
		//'repeatable' => true,
	) );

	$cmb_demo->add_group_field( $grupo_pasos_id, array(
		'name' => __( 'Imagen del paso:', 'cmb2' ),
		'desc' => __( 'Sube una imagen o pega la URL.', 'cmb2' ),
		'id'   => 'imagen',
		'type' => 'file',
	) );

}

And this is what I have on my single.php file:

<code>
				<h3>Ingredientes</h3>
				<?php
				
				// This is the WordPress post ID where the data should be stored/displayed.
				//$object_id = 0;
				$metabox_id = 'ingredientes_lista';
				
				cmb2_metabox_form( $metabox_id );
				
				?>
				<p></p>
				<h3>Pasos a seguir</h3>		
										<?php 
						$entries = get_post_meta( get_the_ID(), 'pasos', true );
						if ( ! empty( $entries ) ) {

							foreach ( (array) $entries as $key => $entry ) {
							
							   $img = $desc = $caption = '';
							
							   if ( isset( $entry['descripcion'] ) ) {
							    	$desc = wpautop( $entry['descripcion'] );
								}
							   if ( isset( $entry['imagen'] ) ) {
							    	$img = wp_get_attachment_image( $entry['imagen'], 'share-pick', null, array( 'class' => 'thumb', ) );
							   }
							
							   $caption = isset( $entry['imagen'] ) ? wpautop( $entry['imagen'] ) : '';
							
							   // Do something with the data
							}
						}
    					?>

Can anyone tell me what am I doing wrong?
Thanks in advance!