Database Connection Error

[2rocketships]

I am trying to set up and am receiving the error: Deprecated: Return type of Database::beginTransaction() should either be compatible with PDO::beginTransaction(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in C:\xampp\htdocs\classes\database.php on line 114.


I am following this tutorial, which may be outdated, but cant seem to find anything newer

I've downloaded all items listed and when on Step 2 of setting up the local host, I receive the error listed above. Can anyone provide any guidance?