Migration wordpress to another server whith an old version php and mysql

This part of the file class-wp-widget-factory.php:

sed ‘16,65!d’ /var/www/wordpress/wp-includes/class-wp-widget-factory.php [AllowDynamicProperties]

class WP_Widget_Factory {

/**
 * Widgets array.
 *
 * @since 2.8.0
 * @var array
 */
public $widgets = array();

/**
 * PHP5 constructor.
 *
 * @since 4.3.0
 */
public function __construct() {
    add_action( 'widgets_init', array( $this, '_register_widgets' ), 100 );
}

/**
 * PHP4 constructor.
 *
 * @since 2.8.0
 * @deprecated 4.3.0 Use __construct() instead.
 *
 * @see WP_Widget_Factory::__construct()
 */
public function WP_Widget_Factory() {
    _deprecated_constructor( 'WP_Widget_Factory', '4.3.0' );
    self::__construct();
}

/**
 * Registers a widget subclass.
 *
 * @since 2.8.0
 * @since 4.6.0 Updated the $widget parameter to also accept a WP_Widget instance object
 *              instead of simply a WP_Widget subclass name.
 *
 * @param string|WP_Widget $widget Either the name of a WP_Widget subclass or an instance of a WP_Widget subclass.
 */
public function register( $widget ) {
    if ( $widget instanceof WP_Widget ) {
        $this->widgets[ spl_object_hash( $widget ) ] = $widget;
    } else {
        $this->widgets[ $widget ] = new $widget();
    }
}

I fixed my issue by changing the php version. My website is in php7.4 and my new installation is in php8.2, so some plugins or themes were not compatible.