Call to undefined method App\Console\Kernel::load() - Laravel 5.4 - php

Question

I downgraded my application from 5.5 to 5.4 and i am getting this error when i run php artisan serve
Call to undefined method App\Console\Kernel::load() - Laravel 5.4
Looking at other solutions, i run composer dump-autoload to resolve this issue but the issue persist. Same error. I don't really know if this is caused by my packages in the composer.json file posted below
What could i do to resolve this now?
Thanks in advance
Composer.Json
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"php": ">=5.6.4",
"barryvdh/laravel-dompdf": "0.8.*",
"fideloper/proxy": "~4.0",
"guzzle/guzzle": "~3.0",
"laravel/framework": "5.4.*",
"laravel/passport": "^3.0",
"laravel/tinker": "~1.0",
"laravelcollective/html": "~5.0",
"maatwebsite/excel": " ~2.1.0",
"pda/pheanstalk": "~2.0",
"picqer/php-barcode-generator": "^0.2.0",
"spatie/laravel-permission": "^2.12",
"yajra/laravel-datatables-oracle": "~8.0"
},
"require-dev": {
"filp/whoops": "~2.0",
"nunomaduro/collision": "~1.1",
"fzaninotto/faker": "~1.4",
"mockery/mockery": "~1.0",
"phpunit/phpunit": "~7.0",
"symfony/thanks": "^1.0"
},
"autoload": {
"classmap": [
"database/seeds",
"database/factories",
"app/commands",
"app/models",
"app/database/seeds",
"app/tests/TestCase.php"
],
"psr-4": {
"App\\": "app/"
}
},
"autoload-dev": {
"psr-4": {
"Tests\\": "tests/"
}
},
"extra": {
"laravel": {
"dont-discover": [
]
}
},
"scripts": {
"post-root-package-install": [
"#php -r \"file_exists('.env') || copy('.env.example', '.env');\""
],
"post-create-project-cmd": [
"#php artisan key:generate"
],
"post-autoload-dump": [
"Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
"#php artisan package:discover"
]
},
"config": {
"preferred-install": "dist",
"sort-packages": true,
"optimize-autoloader": true
},
"minimum-stability": "dev",
"prefer-stable": true
}

Answer 1

The issue is you did not ensure you updated your code to be Laravel 5.4 compatible.
In the Kernel.php boilerplate that comes with Laravel 5.5+ there's the line
$this->load(__DIR__.'/Commands');
This command was added in 5.5 to automatically detect any commands in the app/Console/Commands directory.
In order to get this code to work in 5.4 you need to remove that line and register all your commands manually under the protected $commands = [ ] array in the same file.
The source code for load is in https://github.com/laravel/framework/blob/5.5/src/Illuminate/Foundation/Console/Kernel.php#L196 if you want to try to adapt it and put it in your own Kernel.php

Answer 2

Delete vendor folder and composer.lock file after run composer install command

Answer 3

Go to your_project/app/Console/Kernel.php and remove line
$this->load(DIR.'/Commands');
in commands() function