if (wpdm_is_ajax()) {
                        wp_send_json(array('success' => false, 'message' => 'Error: ' . $errors->get_error_message()));
                        die();
                    }

                    Session::set('wpdm_signup_error', 'Error: ' . $errors->get_error_message(), 300);
                    wp_safe_redirect(wpdm_query_var('permalink', 'url'));
                    die();
                }

                $user_id = wp_create_user($user_login, $user_pass, $user_email);

                $user_meta = array('ID' => $user_id, 'display_name' => $display_name, 'first_name' => $first_name, 'last_name' => $last_name);
                wp_update_user($user_meta);

                if(!defined('WPDM_DISABLE_SIGNUP_ROLES') || WPDM_DISABLE_SIGNUP_ROLES === false) {
                    $valid_roles = get_option('__wpdm_signup_roles', array());

                    if (isset($shortcode_params['role']) && trim($shortcode_params['role']) !== '' && is_array($valid_roles) && count($valid_roles) > 0 && in_array($shortcode_params['role'], $valid_roles)) {
                        $role = $shortcode_params['role'];
                        //Block front-end signup as administrator or any role with edit_files cap
                        if($role !== 'administrator') {
                            $_role = get_role($role);
                            $caps = is_object($_role) && isset($_role->capabilities) ? $_role->capabilities : array();
                            if (!in_array('edit_files', $caps)) {
                                $user = get_user_by('id', $user_meta['ID']);
                                $user->add_role($role);
                            }
                        }

                    }
                }


                //To User
                $usparams = array('to_email' => $user_email, 'name' => $display_name, 'first_name' => $first_name, 'last_name' => $last_name, 'user_email' => $user_email, 'username' => $user_login, 'password' => $user_pass);

                foreach ($_POST['wpdm_reg'] as $key => $value) {
                    $usparams["user_" . $key] = $value;
                }

                //Filter user email params
                $usparams = apply_filters("wpdm_signup_user_mail_params", $usparams, $user_id);

                \WPDM\__\Email::send("user-signup", $usparams);

                //To Admin
                $ip = wpdm_get_client_ip();
                $data = array(
                    array('Name', $display_name),
                    array('Username', $user_login),
                    array('Email', $user_email),
                    array('IP', $ip)
                );
                $css = array('col' => array('background: #edf0f2 !important'), 'td' => 'border-bottom:1px solid #e6e7e8');
                $table = __MailUI::table(null, $data, $css);

                $params['name'] = $display_name;
                $params['username'] = $user_login;
                $params['email'] = $user_email;
                $params['user_ip'] = $ip;
                $params['edit_user_btn'] = "<a class='button' style='display:block;margin:10px 0 0;text-decoration: none;text-align:center;' href='" . admin_url('user-edit.php?user_id=' . $user_id) . "'> " . __("Edit User", "download-manager") . " </a>";
                //Include all data from signup form
                foreach ($_POST['wpdm_reg'] as $key => $value) {
                    $params["user_" . $key] = $value;
                }

                //Filter admin email params
                $params = apply_filters("wpdm_signup_admin_mail_params", $params, $user_id);
                \WPDM\__\Email::send("user-signup-admin", $params);

                Session::clear('guest_order');
                Session::clear('login_error');
                Session::clear('tmp_reg_info');

                $creds['user_login'] = $user_login;
                $creds['user_password'] = $user_pass;
                $creds['remember'] = true;

                if($_verify_email)
                    $reg_success = apply_filters("wpdm_signup_success", __("Your account has been created successfully and login info sent to your mail address.", "download-manager"));
                else
                    $reg_success = apply_filters("wpdm_signup_success", __("Your account has been created successfully.", "download-manager"));

                do_action("wpdm_user_signup", $user_id, wpdm_query_var('wpdm_reg') );

                $_auto_login = isset($shortcode_params['autologin']) && ($shortcode_params['autologin'] === 'true' || (int)$shortcode_params['autologin'] === 1) ? true : false;
                if ((int)get_option('__wpdm_signup_autologin', 0) === 1|| $_auto_login) {
                    $reg_success = apply_filters("wpdm_signup_success", __("Your account has been created successfully.", "download-manager"));
                    wp_signon($creds);
                    wp_set_current_user($user_id);
                    wp_set_auth_cookie($user_id);
                }

                \WPDM\__\Session::set('__wpdm_signup_success', $reg_success, 300);

                if (wpdm_is_ajax()) {
                    $redirect = wpdm_query_var('reg_redirect', 'url');
                    if(!$_auto_login)
                        $redirect = add_query_arg(['signedup' => 1], $redirect);
                    wp_send_json(array('success' => true, 'redirect_to' => $redirect, 'msg' => Session::get('__wpdm_signup_success')));
                    die();
                }
                wp_safe_redirect(wpdm_query_var('reg_redirect', 'url'));
                die();
            } else {
                $reg_error = apply_filters("wpdm_signup_error", __("Email already exist!", "download-manager"), $error_type = 'invalid_email');

                if (wpdm_is_ajax()) {
                    wp_send_json(array('success' => false, 'message' => $reg_error));
                    die();
                }

                \WPDM\__\Session::set('wpdm_signup_error', $reg_error);
                wp_safe_redirect(wpdm_query_var('permalink', 'url'));

                die();
            }
        } else {
            $reg_error = apply_filters("wpdm_signup_error", __("Username already exists.", "download-manager"), $error_type = 'username_exists');

            if (wpdm_is_ajax()) {
                wp_send_json(array('success' => false, 'message' => $reg_error));
                die();
            }

            Session::set('wpdm_signup_error', $reg_error, 300);
            wp_safe_redirect(wpdm_query_var('permalink', 'url'));
            die();
        }

    }
}

<br />
<b>Fatal error</b>:  Uncaught Error: Class 'WPDM\User\Register' not found in /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/src/User/UserController.php:31
Stack trace:
#0 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/src/User/UserController.php(22): WPDM\User\UserController-&gt;__construct()
#1 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/download-manager.php(187): WPDM\User\UserController::getInstance()
#2 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/download-manager.php(151): WPDM\WordPressDownloadManager-&gt;__construct()
#3 /home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/download-manager.php(559): WPDM\WordPressDownloadManager::instance()
#4 /home/kordian1/domains/ostrabrama.pl/public_html/wp-settings.php(522): include_once('/home/kordian1/...')
#5 /home/kordian1/domains/ostrabrama.pl/public_html/wp-config.php(81): require_once('/home/kordia in <b>/home/kordian1/domains/ostrabrama.pl/public_html/wp-content/plugins/download-manager/src/User/UserController.php</b> on line <b>31</b><br />