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

nothing worked. So I installed a new project, and I read Handler.php in App\Exceptions, it was different, probably because I copied some solution and Internet and deleted the following:

protected $dontReport = [
    //
];

protected $dontFlash = [
    'password',
    'password_confirmation',
];

I copy here all of Handler.php generated by laravel 7.5, may be useful for someone:

<?php

namespace App\Exceptions;

use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Throwable;

class Handler extends ExceptionHandler
{
    /**
     * A list of the exception types that are not reported.
     *
     * @var array
     */
    protected $dontReport = [
        //
    ];

/**
 * A list of the inputs that are never flashed for validation exceptions.
 *
 * @var array
 */
protected $dontFlash = [
    'password',
    'password_confirmation',
];

/**
 * Report or log an exception.
 *
 * @param  \Throwable  $exception
 * @return void
 *
 * @throws \Exception
 */
public function report(Throwable $exception)
{
    parent::report($exception);
}

/**
 * Render an exception into an HTTP response.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \Throwable  $exception
 * @return \Symfony\Component\HttpFoundation\Response
 *
 * @throws \Throwable
 */
public function render($request, Throwable $exception)
{
    return parent::render($request, $exception);
}

}

Answer 2

This happens because you have upgraded to Laravel 7.

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

<?php

namespace App\Exceptions;

use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Throwable; // <-- ADD THIS

class Handler extends ExceptionHandler
{
    public function report(Throwable $exception) // <-- USE Throwable HERE
    {
        parent::report($exception);
    }
    public function render($request, Throwable $exception) // AND HERE
    {
        return parent::render($request, $exception);
    }
}

This is documented in the official upgrade guide here:

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

Answer 3

This is not an actual error. If you look a bit above you'll see the actual error. In my case, there was an error in my code:

PHP Fatal error:  Declaration of 
App\Exceptions\Handler::render($request, App\Exceptions\Exception $exception)
must be compatible with 
Illuminate\Foundation\Exceptions\Handler::render($request, Throwable $e)

It is not possible to tell you what is actually a problem in your code, so you have to look real reason for this error in your stack trace.

Answer 4

Same issue when I update laravel from 6.x to 7.x

I tried the most voted answer but it didn't work, then I used php artisan serve I noticed that:

RuntimeException

In order to use the Auth::routes() method, please install the laravel/ui package.

Try composer require laravel/ui maybe it will work.

Answer 5

Hello everybody/ hello world. I solved my problem that way:

---

I deleted my project I created a new folder and cloned the repository again and after that I gave composer install / update

good luck.

Answer 6

I got the same problem in Win 8 and solve it:

Here is the steps.

Step-1: Go to your project directory

Step-2: And type command cd bootstrap/cache/

Step-3: Again type command del -rf *.php

Step-4: Update your composer composer update

Step-5: Now you are done: php artisan serve

Thanks.