Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/mz027500/www_root/wp-includes/l10n.php on line 799 and defined in /home/mz027500/www_root/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/mz027500/www_root/wp-includes/l10n.php(799): WP_Translation_Controller->set_locale(NULL) #1 /home/mz027500/www_root/wp-admin/includes/admin.php(17): load_textdomain('default', '/home/mz027500/...', NULL) #2 /home/mz027500/www_root/wp-content/plugins/simple-backup/simple-backup-plugin-installer.php(7): require_once('/home/mz027500/...') #3 /home/mz027500/www_root/wp-content/plugins/simple-backup/simple-backup-loader.php(53): include_once('/home/mz027500/...') #4 /home/mz027500/www_root/wp-settings.php(517): include_once('/home/mz027500/...') #5 /home/mz027500/www_root/wp-config.php(43): require_once('/home/mz027500/...') #6 /home/mz027500/www_root/wp-load.php(50): require_once('/home/mz027500/...') #7 /home/mz0 in /home/mz027500/www_root/wp-includes/l10n/class-wp-translation-controller.php on line 87

Fatal error: Uncaught TypeError: Argument 1 passed to WP_Translation_Controller::set_locale() must be of the type string, null given, called in /home/mz027500/www_root/wp-includes/l10n.php on line 799 and defined in /home/mz027500/www_root/wp-includes/l10n/class-wp-translation-controller.php:87 Stack trace: #0 /home/mz027500/www_root/wp-includes/l10n.php(799): WP_Translation_Controller->set_locale(NULL) #1 /home/mz027500/www_root/wp-includes/l10n.php(953): load_textdomain('default', '/home/mz027500/...', NULL) #2 /home/mz027500/www_root/wp-includes/class-wp-fatal-error-handler.php(49): load_default_textdomain() #3 [internal function]: WP_Fatal_Error_Handler->handle() #4 {main} thrown in /home/mz027500/www_root/wp-includes/l10n/class-wp-translation-controller.php on line 87