Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255

Question

I moved my project from desk to another.
When I run php artisan it does not work.

I tried to run composer update, but it returns the

Answer 1

This happens because you have upgraded to Laravel 7.

To fix it, update app/Exceptions/Handler.php like so:

This is documented in the official upgrade guide here:

https://laravel.com/docs/7.x/upgrade#symfony-5-related-upgrades