syntax error, unexpected 'protected' (T_PROTECTED), expecting variable (T_VARIABLE)

[starking8b]

hello , I installed this package using this command
composer require spatie/laravel-backup
then I published the config files
php artisan vendor:publish --provider="Spatie\Backup\BackupServiceProvider"

but I have this error
"message": "syntax error, unexpected 'protected' (T_PROTECTED), expecting variable (T_VARIABLE)",
"exception": "ParseError",
"file": "vendor/spatie/laravel-backup/src/Tasks/Cleanup/CleanupStrategy.php",
line 14

and I have the same error in this file
vendor/spatie/laravel-backup/src/Notifications/EventHandler.php

class EventHandler
{
   
    public function __construct(
       Protected   Repository $config
    ) {
    }

but I solved like this

class EventHandler
{
    protected $config;
    public function __construct(
         Repository $config
    ) {
    }