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When I run
php artisan
it does not work.
I tried to run
composer update
, but it returns the error
Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255
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This is how I solved this after an upgrade from laravel version 6.x - 7.x:
In
App\Exceptions\Handler
changed
//Use Exception;
Use Throwable;
Then methods to accept instances of Throwable instead of Exceptions as follows:
//public function report(Exception$exception);
public function report(Throwable $exception);
//public function render($request, Exception $exception);
public function render($request, Throwable $exception);
In config\session.php:
//'secure' => env('SESSION_SECURE_COOKIE', false),
'secure' => env('SESSION_SECURE_COOKIE', null),
Then run composer update
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The bootstrap directory contains the app.php file that initializes the structure. This directory also houses a cache directory that contains structure-generated files for performance optimization, such as files and route cache services. Laravel stores configuration files, provider, and cached services to optimize the fetching of this information. The problem with me was when the other developer ran the 'php artisan config: cache' command on your machine and since the cache folder contains files that can be deleted, I deleted them and solved the problem.
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If this happened after Laravel update from 6.x to 7.x, then this could be due to the update of Symfony. See the upgrade guide of this part:
https://laravel.com/docs/7.x/upgrade#symfony-5-related-upgrades
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As @nobuhiroharada mentioned that I had missed .env file in my project
Second is that Laravel removed Exception and replaced it with Throwable. So we need to fix that in our app\Exceptions\Handler.php. One can refer Medium.com for the error fix.
In the upgrade guide of Laravel 8.x you need to update the dependencies like this
Next, in your composer.json file, remove classmap block from the autoload section and add the new namespaced class directory mappings:
"App\\": "app/",
"Database\\Factories\\": "database/factories/",
"Database\\Seeders\\": "database/seeders/"
This happens because you have upgraded to Laravel 7.
To fix it, update app/Exceptions/Handler.php like so:
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
Do you have .env file in your new project?
I had same error message. When I add .env file, error is gone.
success message like this.
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover
Discovered Package: fideloper/proxy
Discovered Package: ixudra/curl
Discovered Package: laravel/tinker
Discovered Package: nesbot/carbon
Discovered Package: socialiteproviders/manager
Package manifest generated successfully.
I hope this will help you.
maybe you have an error in the project code (for example, in routes or controller). This may be one of the reasons for this error.
In my project, the web.php file has a syntax error. I defined this when I started the php artisan command
C:\OSPanel\domains\lara.shop.loc>php artisan
In web.php line
syntax error, unexpected end of file
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.
I had this same problem when running composer update in a Laravel project. In the package.json it's configured to run artisan package:discover, which failed with:
Class 'Symfony\Component\Translation\Translator' not found in vendor/nesbot/carbon/src/Carbon/Translator.php on line 18
When I looked in the vendor/symfony/translation directory I found that it was completely empty, which explained the error.
The solution was to completely delete the vendor directory and then re-run composer update. This was the only way that I was able to make composer install the missing files.
I had the same issue, my problem was the PHP version of the server account did not match my Docker container. The SSH terminal was using the global php version for the server.
php -v
Confirm it's the version your project needs.
Composer did warn me that a higher php version was required but I rm -rf'd /vendor and ./composer.lock without paying too much attention to the warnings!
Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255
And this works for me.
When I switch another linux user. It works.
some files are owned by another linux user.
So I use root account and change all the project file to the specific user,
chown -R www:www project/
and use that user to execute composer cmd
and then it works.
My case/solution, in case it helps anyone...
I copied my repo over from my old Windows computer to a new one, and installed the latest php.
composer install was returning:
Root composer.json requires php ^7.1.3 but your php version (8.1.10) does not satisfy that requirement
...which I thought was odd (assuming 8 satisfied ^7), so I continued on with composer install --ignore-platform-reqs, and ended up with this particular issue.
After trying a bunch of other possible solutions, what ended up working for me was simply downgrading to the same PHP version from my old machine (7.4.33).
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.
I got the same problem in Win 10 and solve it:
Here is the steps.
Step-1: Go to your project directory
Step-2: Update your composer
composer update
Step-3: Now you are done: php artisan serve
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:
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);
For me it was related to Kernel.php
I was adding new schedule task into the Kernel. I also updated some controllers, views, and installed twilio extension.
The error did not provide more information than
Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255
@Suresh Pangeni refences the Kernel.php doc so I checked by doc that is in PROJECTFOLDER\app\Console\Kernel.php
protected $commands = [
Commands\Inspire::class,
Commands\Test::class
\App\Console\Commands\Message::class,
Missing Comma between Commands\Test::class and the next line didn't let me proceed. It provided no further warning or information when I ran composer dump-autoload.
Hope this can help someone else that has a similar issue!
I had the same error today, the causes are as follows:
cause 1: the env file contains space in one of the configuration.
cause 2: incorrect configuration of the Handler file belonging to the App\Exceptions namespace;
cause 3: incorrect configuration of a file inheriting ExceptionHandler
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I was using Laravel 9.x and got the same error after trying to install this package maatwebsite/excel!
thanks to @samuel-terra and @dqureshiumar there is the solution worked for me:
clear bootstrap/cache:
cd bootstrap/cache/
rm -rf *.php
then run composer update:
composer update
Handler.php
The problem originates from this code:
this->container->make(FlasherInterface::class);
My solution, I removed the construction directly and the problem is solved.
public function __construct(Container $container)
parent::__construct($container);
$this->flasher = $this->container->make(FlasherInterface::class);
//$this->request = $this->container->get(Request::class);
Getting this error when my composer version 2.x then i rollback this
composer self-update --1
Now its perfectly working
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