Errore ad un plugin che genera post da CF7

Ciao a tutti,

dopo i due più recenti aggiornamenti di wordpress non mi funziona più un plugin che genera post di una determinata categoria derivante dalla compilazione di moduli di CF7.
L’ho controllato e ricontrollato eppure niente da fare, con il debug di wordpress mi esce il seguente errore:

Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function “add_author_support_to_posts” not found or invalid function name in /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-includes/class-wp-hook.php:324

Stack trace: 0 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() 1 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-includes/plugin.php(517): WP_Hook->do_action() 2 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-settings.php(643): do_action() 3 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-config.php(82): require_once(‘…’) 4 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-load.php(50): require_once(‘…’) 5 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-blog-header.php(13): require_once(‘…’) 6 /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/index.php(17): require(‘…’) 7 {main} thrown in /var/www/virtual/mlnv.org/sportelodelsitadino/htdocs/wp-includes/class-wp-hook.php on line 324

Questo di seguito alla fine è il codice php del plugin, so che è lunghetto ma se qualcuno gentilmente mi aiuta a trovar l’errore gliene sarei molto grato.
Grazie infinite

Enrico

<?php

if (!defined('ABSPATH')) {
    exit;
}

/**
 * Our main plugin class
 */
class CF7_To_WP
{

    /**
     * The single instance of cf7_to_wp.
     * @var     object
     */
    private static $_instance = null;

    /**
     * Settings class object
     * @var     object
     */
    public $settings = null;

    /**
     * The version number.
     * @var     string
     */
    public $_version;

    /**
     * The token.
     * @var     string
     */
    public $_token;

    /**
     * The main plugin file.
     * @var     string
     */
    public $file;

    /**
     * The main plugin directory.
     * @var     string
     */
    public $dir;

    /**
     * The plugin assets directory.
     * @var     string
     */
    public $assets_dir;

    /**
     * The plugin assets URL.
     * @var     string
     */
    public $assets_url;

    /**
     * Our post type slug.
     *
     * @var string
     */
    private $post_type = 'cf7_form_messages';

    /**
     * Constructor function.
     * @access  public
     */
    public function __construct($file = '', $version = '0.1')
    {
        $this->_version = $version;
        $this->_token = 'cf7_to_wp';

        // Load plugin environment variables
        $this->file = $file;
        $this->dir = dirname($this->file);
        $this->assets_dir = trailingslashit($this->dir) . 'assets';
        $this->assets_url = esc_url(trailingslashit(plugins_url('/assets/', $this->file)));

        // Handle localization
        $this->load_plugin_textdomain();
        add_action('init', array($this, 'load_localization'), 0);
    }

    /**
     * Initialize all the things!
     */
    public function init()
    {
        // Register Messages post type.
        add_action('init', array($this, 'register_form_msg_post_type'));
        add_filter('add_menu_classes', array($this, 'menu_msg_form_bubble'));
        add_filter('post_row_actions', array($this, 'action_row_for_msg_posts'), 10, 2);
        add_action('admin_init', [$this, 'maybe_mark_form_message_as_read']);
        add_filter('wpcf7_verify_nonce', '__return_true');

        // Hook into CF7 actions.
        add_filter('wpcf7_editor_panels', array($this, 'add_cf7_panel'));
        add_action('wpcf7_after_save', array($this, 'save_cf7_data'), 50, 1);
        add_action('wpcf7_mail_sent', array($this, 'create_post_on_form_submission'), 50, 1);
        add_action('wpcf7_mail_failed', array($this, 'create_post_on_form_submission'), 50, 1);
        add_action('init', 'add_author_support_to_posts');
        add_filter('wpcf7_verify_nonce', '__return_true');
    }

    /**
     * Load plugin localisation
     */
    public function load_localization()
    {
        load_plugin_textdomain('cf7_to_wp', false, dirname(plugin_basename($this->file)) . '/lang/');
    }

    /**
     * Load plugin textdomain
     */
    public function load_plugin_textdomain()
    {
        $domain = 'cf7_to_wp';
        $locale = apply_filters('plugin_locale', get_locale(), $domain);
        load_textdomain($domain, WP_LANG_DIR . '/' . $domain . '/' . $domain . '-' . $locale . '.mo');
        load_plugin_textdomain($domain, false, dirname(plugin_basename($this->file)) . '/lang/');
    }

    /**
     * Register our post type to store messages.
     */
    public function register_form_msg_post_type()
    {
        register_post_type(
            $this->post_type,
            array(
                'labels' => array(
                    'name' => __('Pratiche', 'cf7_to_wp'),
                    'singular_name' => __('Pratica', 'cf7_to_wp'),
                    'add_new' => __('Aggiungi nuova', 'cf7_to_wp'),
                    'add_new_item' => __('Aggiungi nuova pratica', 'cf7_to_wp'),
                    'edit' => __('Modifica', 'cf7_to_wp'),
                ),
                'description' => 'Pratiche e Servizi',
                'has_archive' => true,
                'publicly_queryable' => true,
                'capability_type' => 'post',
                'menu_position' => 32,
                'show_ui' => true,
                'show_in_menu' => true,
                'public' => true,
                'query_var' => true,
                'menu_icon' => 'dashicons-buddicons-pm',
                'taxonomies' => array('category'),
                'supports' => array(
                    'author',
                    'title',
					'category',
                    'editor',
                    'excerpt',
                    'trackbacks',
                    'page-attributes',
                    'custom-fields',
                    'thumbnail',
                    'sticky',
                ),
            )
        );
    }

    /**
     * Add bubble to admin menu
     *
     * @param array $menu
     * @return array $menu
     */
    public function menu_msg_form_bubble($menu)
    {
        $form_messages_count = wp_count_posts($this->post_type);
        $pending_count = $form_messages_count->draft + $form_messages_count->pending;

        foreach ($menu as $menu_key => $menu_data) {
            if ("edit.php?post_type={$this->post_type}" !== $menu_data[2]) {
                continue;
            }

            $menu[$menu_key][0] .= " <span class='update-plugins count-$pending_count'><span class='plugin-count'>" . number_format_i18n($pending_count) . '</span></span>';
        }

        return $menu;
    }

    /**
     * Add "Mark as read" action for our post type
     *
     * @param array $actions
     * @param WP_Post $post
     * @return array $actions
     */
    public function action_row_for_msg_posts($actions, $post)
    {
        if ($post->post_type === $this->post_type && $post->post_status !== 'publish') {
            $actions['mark_as_read'] = sprintf(
                '<a href="%s" class="aria-button-if-js" aria-label="%s">%s</a>',
                wp_nonce_url("edit.php?post_type={$this->post_type}&action=mark_as_read&message_id={$post->ID}", "mark_message_as_read_{$post->ID}"),
                esc_attr(__('Mark as read', 'cf7_to_wp')),
                __('Mark as read', 'cf7_to_wp')
            );
        }

        return $actions;
    }

    /**
     * Mark form message as read
     */
    public function maybe_mark_form_message_as_read()
    {
        if (isset($_GET['action']) && $_GET['action'] == 'mark_as_read' && isset($_GET['message_id'])) {
            $message_id = (int) $_GET['message_id'];

            if (isset($_GET['_wpnonce']) && wp_verify_nonce($_GET['_wpnonce'], "mark_message_as_read_{$message_id}")) {
                $updated_post = wp_update_post(
                    array(
                        'ID' => $message_id,
                        'post_status' => 'publish',
                    )
                );

                wp_redirect(wp_get_referer());
                exit();
            }
        }
    }

    /**
     * Add new panel to CF7 form settings
     *
     * @param array $panels
     * @return array
     */
    public function add_cf7_panel($panels)
    {
        $panels['cf7-to-wp'] = array(
            'title' => __('Salva messaggi', 'cf7_to_wp'),
            'callback' => array($this, 'cf7_to_wp_form_metabox'),
        );

        return $panels;
    }

    /**
     * Output the content of our panel/metabox
     *
     * @param WPCF7_ContactForm $post CF7 object
     */
    public function cf7_to_wp_form_metabox($post)
    {
        $id = $post->id();
        $cf7towp = get_post_meta($id, '_cf7towp', true);
        $cf7towp = wp_parse_args(
            $cf7towp,
            array(
                'active' => 0,
                'title' => '',
                'content' => '',
                'category' => 0,
            )
        );?>

		<p style="margin-bottom:1em; font-size:1.25em;">
			<?php _e('Abilitando la casella sottostante ogni modulo inviato compilato verrà pubblicato come nuovo articolo "Pratiche" privato.', 'cf7_to_wp');?>
		</p>

		<div class="mail-field" style="margin-bottom:1em;">
			<label for="cf7towp-active">
				<input type="checkbox" id="cf7towp-active" name="wpcf7-cf7towp-active" value="1" <?php checked($cf7towp['active'], 1);?> />
				<strong><?php echo esc_html(__('Salvare i moduli compilati come articoli "Pratiche"?', 'cf7_to_wp')); ?></strong>
			</label>

		</div>

		<div class="pseudo-hr"></div>

		<div class="mail-field">
			<p class="description">
				<label for="cf7towp-category"><?php echo esc_html(__('Categoria dell\'articolo', 'cf7_to_wp')); ?></label>
				<select id="cf7towp-category" name="wpcf7-cf7towp-category">
					<?php $this->get_category_options($id)?>
				</select>
			</p>
		</div>

		<div class="mail-field">
			<p class="description">
				<label for="cf7towp-title"><?php echo esc_html(__('Titolo dell\'articolo', 'cf7_to_wp')); ?></label>
				<input type="text" id="cf7towp-title" name="wpcf7-cf7towp-title" class="large-text" value="<?php echo esc_attr($cf7towp['title']); ?>" />
			</p>
		</div>

		<div class="mail-field">
			<p class="description">
				<label for="cf7towp-content"><?php echo esc_html(__('Contenuto dell\'articolo', 'cf7_to_wp')); ?></label>
				<textarea id="cf7towp-content" name="wpcf7-cf7towp-content" cols="100" rows="10" class="large-text"><?php echo esc_attr($cf7towp['content']); ?></textarea>
			</p>
		</div>

		<hr>

		<p class="description" style="margin-top:.5em;">
			<span style="float:left; width:60%;">
				<?php _e('Usa i classici CF7 [mail-tag] per i contenuti dinamici nel titolo e nel contenuto (li trovi sulla tab Mail).', 'cf7_to_wp');?>
			</span>
			<span style="text-align:right; float:right; width:40%;">
				<?php
$credits_link = '<a target="_blank" href="https://github.com/psaikali/contact-form-to-wp-posts">Fonte</a>';
        printf(__('A Contact Form 7 addon by %1$s', 'cf7_to_wp'), $credits_link);
        ?>
			</span>
		</p>

		<hr>
	<?php }

    /**
     * Get category field data
     */

    public function get_category_options($id)
    {

        $cf7towp = get_post_meta($id, '_cf7towp', true);
        $cf7towp = wp_parse_args(
            $cf7towp,
            array(
                'active' => 0,
                'title' => '',
                'content' => '',
                'category' => 0,
            )
        );

        $args = array(
            'taxonomy' => 'category',
            'hide_empty' => false,
        );

        $terms = get_terms($args);

        foreach ($terms as $term) {
            $options .= '<option value="' . $term->term_id . '" ' . selected($cf7towp['category'], $term->term_id, true) . '>' . $term->name . '</option>';
        }

        echo $options;

    }

    /**
     * Save metabox/tab data when CF7 form settings page is saved.
     *
     * @param WPCF7_ContactForm $contact_form
     */
    public function save_cf7_data($contact_form)
    {
        global $user_id;
        $user_id = get_current_user_id();
        $id = $contact_form->id();
        $cf7towp = array();
        $cf7towp['active'] = (!empty($_POST['wpcf7-cf7towp-active']));

        if (isset($_POST['wpcf7-cf7towp-title'])) {
            $cf7towp['title'] = sanitize_text_field($_POST['wpcf7-cf7towp-title']);
        }

        if (isset($_POST['wpcf7-cf7towp-content'])) {
            $cf7towp['content'] = wp_kses_post($_POST['wpcf7-cf7towp-content']);
        }

        if (isset($_POST['wpcf7-cf7towp-category'])) {
            $cf7towp['category'] = wp_kses_post($_POST['wpcf7-cf7towp-category']);
        }

        update_post_meta($id, '_cf7towp', $cf7towp);
    }

    /**
     * Create a Messages post when form is submitted
     *
     * @param WPCF7_ContactForm $contact_form
     */

    public function get_current_user_id()
    {
        if (class_exists('Jwt_Auth_Public')) {
            $jwt = new \Jwt_Auth_Public('jwt-auth', '1.1.0');
            $token = $jwt->validate_token(false);
            if (\is_wp_error($token)) {
                return false;
            }

            return $token->data->user->id;
        } else {
            return false;
        }
    }

    public function create_post_on_form_submission($contact_form)
    {

        $form_post = $contact_form->id();
        $cf7towp_data = get_post_meta($form_post, '_cf7towp', true);

        if ($cf7towp_data['active'] === true) {
            $submission = WPCF7_Submission::get_instance();

            if ($submission) {
                $meta = array();
                $meta['ip'] = $submission->get_meta('remote_ip');
                $meta['ua'] = $submission->get_meta('user_agent');
                $meta['url'] = $submission->get_meta('url');
                $meta['date'] = date_i18n(get_option('date_format'), $submission->get_meta('timestamp'));
                $meta['time'] = date_i18n(get_option('time_format'), $submission->get_meta('timestamp'));
            }

            $post_title_template = $cf7towp_data['title'];
            $post_content_template = $cf7towp_data['content'];
            $post_category[] = $cf7towp_data['category'];

            $post_title = wpcf7_mail_replace_tags(
                $post_title_template,
                array(
                    'html' => true,
                    'exclude_blank' => true,
                    'has_archive' => true,
                )
            );

            $post_content = wpcf7_mail_replace_tags(
                $post_content_template,
                array(
                    'html' => true,
                    'exclude_blank' => true,
                    'has_archive' => true,
                )
            );

            $new_form_msg = wp_insert_post(

                array(
                    'post_type' => $this->post_type,
                    'post_title' => $post_title,
                    'post_content' => $post_content,
                    'post_author' => $current_user -> ID,
                    'post_status' => 'private',
                    'has_archive' => true,
                    'post_category' => $post_category,
                )
            );

            if ($submission) {
                update_post_meta($new_form_msg, 'cf7towp_meta', $meta, );
            }
        }
    }

    /**
     * Main cf7_to_wp singleton instance
     *
     * Ensures only one instance of cf7_to_wp is loaded or can be loaded.
     *
     * @static
     * @see cf7_to_wp()
     * @return Main cf7_to_wp instance
     */
    public static function instance($file = '', $version = '0.1')
    {
        if (is_null(self::$_instance)) {
            self::$_instance = new self($file, $version);
        }
        return self::$_instance;
    }

    /**
     * Cloning is forbidden.
     *
     */
    public function __clone()
    {
        _doing_it_wrong(__FUNCTION__, __('Cheatin’ huh?'), $this->_version);
    }

    /**
     * Unserializing instances of this class is forbidden.
     *
     */
    public function __wakeup()
    {
        _doing_it_wrong(__FUNCTION__, __('Cheatin’ huh?'), $this->_version);
    }
}