Your requirements could not be resolved to an installable set of packages in laravel 5.7 - php

Question

Unable to install package from laravel 5.7
Using version ^0.8.4 for barryvdh/laravel-dompdf ./composer.json has been updated
Loading composer repositories with package information Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for laravel/passport == 7.2.1.0
-> satisfiable > by laravel/passport[v7.2.1].
- avored/ecommerce 2.0 requires laravel/passport 5.0.*
-> satisfiable by laravel/passport[5.0.x-dev].
- avored/ecommerce 2.0.1 requires laravel/passport 5.0.*
-> satisfiable by laravel/passport[5.0.x-dev].
- Conclusion: don't install laravel/passport 5.0.x-dev
- Installation request for avored/ecommerce 2.*
-> satisfiable by > avored/ecommerce[2.0, 2.0.1].
Installation failed, reverting ./composer.json to its original content.
My composer.json file:
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"php": "^7.1.3",
"avored/ecommerce": "2.*",
"avored/module-installer": "1.*",
"fideloper/proxy": "^4.0",
"laravel/framework": "5.7.*",
"laravel/passport": "^7.2",
"laravel/tinker": "^1.0",
"laravelcollective/html": "^5.7",
"unisharp/laravel-filemanager": "^1.8"
},
"require-dev": {
"beyondcode/laravel-dump-server": "^1.0",
"filp/whoops": "^2.0",
"fzaninotto/faker": "^1.4",
"mockery/mockery": "^1.0",
"nunomaduro/collision": "^2.0",
"phpunit/phpunit": "^7.0",
"laravel/dusk": "^4.0"
},
"autoload": {
"classmap": [
"database/seeds",
"database/factories"
],
"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

Delete to this in your composer.json file:
"require": {
"avored/ecommerce": "2.*",
}
Then update composer: composer update
This package(avored/ecommerce) is not compatible with Laravel 5.7
For testing purpose I have try this command(composer require avored/ecommerce) in Laravel 5.5, 5.6 and 5.7
It's worked only Laravel5.5, other 5.6 and 5.7 I also got the same error as yours.

Answer 2

There is a dependency conflict specified on the composer.json file, you are stating that you want "laravel/passport": "^7.2" or later, but as you can seee on the avored composer file it requieres laravel/passport 5.0 so downgrade your dependency requirement.
Also I'm pretty sure passport 5.x is compatible with Laravel 5.6 so you need to downgrade laravel to ^5.6 as well.
Change:
"laravel/framework": "5.7.*",
"laravel/passport": "^7.2",
with:
"laravel/framework": "5.6.*",
"laravel/passport": "^5.0",
And then execute composer update