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

Today We are Going To Solve Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255 in Php. Here we will Discuss All Possible Solutions and How this error Occurs So let’s get started with this Article.

How to Fix Script @php artisan package:discover handling the post-autoload-dump event returned with error code 255 Error?

Solution 1 : Follow this steps

This error occurs because of you have missed .env file in your project and Laravel removed Exception and replaced it with Throwable. So you need to fix that in your app\Exceptions\Handler.php. Then update the dependencies. And after it in your composer.json file, remove classmap block from the autoload section and You have to just add new namespaced class directory mappings just like below example.

"autoload": {
    "psr-4": {
        "App\\": "app/",
        "Database\\Factories\\": "database/factories/",
        "Database\\Seeders\\": "database/seeders/"
    }
},

After it  just run composer update.You can see your error is removed.

Solution 2 : Run these commands

First of all go to your project directory and type cd bootstrap/cache/ command and again type the del -rf *.php command, After it just update your composer composer update. And at the end run this command rve. It will solve your problem.

Solution 3 : Try composer require laravel/ui

First of all use

 php artisan serve

And after it try 

composer require laravel/ui

It will solve your error.

Conclusion

So these were all possible solutions to this error. I hope your error has been solved by this article. In the comments, tell us which solution worked? If you liked our article, please share it on your social media and comment on your suggestions. Thank you.

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