Fatal error: Class 'Illuminate\Foundation\Application' not found

小开

Something is clearly corrupt in your Laravel setup and it is very hard to track without more info about your environment. Usually these 2 commands help you resolve such issues

php artisan clear-compiled
composer dump-autoload

If nothing else helps then I recommend you to install fresh Laravel 5 app and copy your application logic over, it should take around 15 min or so.

小开

In my situation, I didn't have the full vendor dependencies in place (composer file was messed up during original install) - so running any artisan commands caused a failure.

I was able to use the --no-scripts flag to prevent artisan from executing before it was included. Once my dependencies were in place, everything worked as expected.

composer update --no-scripts

小开

Just in case I trip over this error in 2 weeks again... My case: Checkout an existing project via git and pull in all dependencies via composer. Came down to the same error listed within the title of this post.

Solution:

composer dump-autoload
composer install --no-scripts

make sure everything works now as expected (no errors!)

composer update

小开

I just fixed this problem (Different Case with same error),
The answer above I tried may not work because My case were different but produced the same error.
I think my vendor libraries were jumbled,
I get this error by:
1. Pull from remote git, master branch is codeigniter then I do composer update on master branch, I wanted to work on laravel branch then I checkout and do composer update so I get the error,

Fatal error: Class 'Illuminate\Foundation\Application' not found in C:\cms\bootstrap\app.php on line 14

Solution: I delete the project on local and do a clone again, after that I checkout to my laravel file work's branch and do composer update then it is fixed.

小开

please test below solution:

first open command prompt cmd ==> window+r and go to the location where laravel installed.
try composer require laravel/laravel

小开

For latest laravel version also check your version because I was also facing this error but after update latest php version, I got rid from this error.

小开

I had accidentally commented out:

require __DIR__.'/../bootstrap/autoload.php';

in /public/index.php

When pasting in some debugging statements.

小开

I can't imagine that anyone else reading this is a stupid as I was but just in case... I had accidentally removed "laravel/framework": "^5.6" from my composer.json when resolving merge conflicts.

小开

In my case composer was not installed in that directory. So I run

composer install

then error resolved.

or you can try

composer update --no-scripts
cd bootstrap/cache/->rm -rf *.php
composer dump-autoload

小开

Easy as this, that worked for my project

Delete /vendor folder
and execute composer install
then run project php artisan serve

小开

i was having same problem with this error. It turn out my Kenel.php is having a wrong syntax when i try to comply with wrong php8 syntax

The line should be

protected $commands = [
//
];

instead of

protected array $commands = [
//
];

小开

run composer require laravel/framework after composer install then php artisan key:generate its work for me in kali linux

小开

@kalhan-toress 's comment is what ACTUALLY WORKED FOR ME
remove /bootstrap/start.php,composer.lock, and the vendor and run composer install

小开

In my case, the error was caused on initial deployment because I didn't have a .env file in that directory (because those don't belong on Github where the files were transferred from).

小开

check your .env file i think you miss something. Maybe like this

if yes then need to add manually and composer update or install composer