^^&&^^

Edit File: file_manager_advanced.php

<?php
/**
  Plugin Name: File Manager Advanced
  Plugin URI: https://wordpress.org/plugins/file-manager-advanced
  Description: Cpanel for files management in wordpress
  Author: wpexpertsio
  Version: 5.3.0
  Author URI: https://wpexperts.io
  License: GPLv2
**/
/**
 * Loading constants
 */
require_once('constants.php');
/*
 * Advanced File Manager
 * Text Domain
 */
add_action('plugins_loaded', 'advanced_file_manager_load_text_domain');
function advanced_file_manager_load_text_domain()
{
    $domain = dirname(plugin_basename(__FILE__));
    $locale = apply_filters('plugin_locale', get_locale(), $domain);
    load_textdomain($domain, trailingslashit(WP_LANG_DIR).'plugins'.'/'.$domain.'-'.$locale.'.mo');
    load_plugin_textdomain($domain, false, basename(dirname(__FILE__)).'/languages/');
}
/**
 * Main application
 */
if(is_admin()) {
	include('application/class_fma_main.php');
	new class_fma_main;
}
/**
 * Shortcode class
 */
include('application/class_fma_shortcode.php');
include 'application/rest-api/class-fma-controller.php';