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

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When you using “laravel 5.5” downloaded project then showing this type of error, then first open terminal and got to project as below commands

step-1

$ cd project_name

$ composer update

$ composer dump-autoload

After that your problem will be solve. If will not be solve then below commands

$ composer require laravel/ui

After that run this commands. you project will be run successfully.

$ php artisan serve