Laravel: Class 'GuzzleHttp\Client' not found - php

Question

I am trying to use Mandrill to send emails via my Laravel framework, however I am receiving the following error:
FatalErrorException in MandrillTransport.php line 114: Class
'GuzzleHttp\Client' not found
I have installed Guzzle using the following command in Terminal:
"guzzlehttp/guzzle": "~4.0"
According to Laravel's documentation I need to add "guzzlehttp/guzzle": "~4.0" to my composer.json file, but I'm not sure if where I have placed it is correct as I still see the error.
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"laravel/framework": "5.0.*",
"illuminate/html": "^5.0",
"guzzlehttp/guzzle": "~4.0"
},
"require-dev": {
"phpunit/phpunit": "~4.0",
"phpspec/phpspec": "~2.1"
},
"autoload": {
"classmap": [
"database"
],
"psr-4": {
"App\\": "app/"
}
},
"autoload-dev": {
"classmap": [
"tests/TestCase.php"
]
},
"scripts": {
"post-install-cmd": [
"php artisan clear-compiled",
"php artisan optimize"
],
"post-update-cmd": [
"php artisan clear-compiled",
"php artisan optimize"
],
"post-create-project-cmd": [
"php -r \"copy('.env.example', '.env');\"",
"php artisan key:generate"
]
},
"config": {
"preferred-install": "dist"
}
}
Here is the list of packages my application has, notice that guzzle has a different version: 4.2.3 which i've also tried updating to but still get the same error.

Answer 1

Open up your terminal at the root of your project and enter
composer require guzzlehttp/guzzle
It worked for the mailgun API. For some reason, the suggested method at the laravel's mail doc. You may install this package to your project by adding the following line to your composer.json file
"guzzlehttp/guzzle": "~5.3|~6.0"
doesn't make the composer download the Guzzle source codes. By the way, I didn't find out what | means in determining the version. This command just downloads the PSR code.
In this moment, the solution may work. However, be aware of compatibility issues. Because the command would install the latest stable version, not the suitable one.

Answer 2

If you're using Laravel when you run into this error, just run:
composer require guzzlehttp/guzzle
And try again.

Answer 3

After updating your composer.json file you need to run the update command to resolve and install your dependencies:
composer update
or, if composer isn't in your path:
php composer.phar update

Answer 4

Did you try :
artisan clear-compiled
or if artisan is not available try to remove compiled.php if exist (in vendor directory) and launch composer dumpautoload

Answer 5

I had the same issue.
I used an old version in order to work.
It's not working anymore since version 4.
It works on version 3.8.1
So you can add "guzzlehttp/guzzle": "~3" to works

Answer 6

simple in my case add "guzzlehttp/guzzle": "^6.3" in composer.json
require object as mentioned below
"require": {
"php": ">=7.0.0",
"ext-gd": "*",
"barryvdh/laravel-cors": "^0.11.2",
"barryvdh/laravel-dompdf": "^0.8.1",
"dingo/api": "2.0.0-alpha1",
"doctrine/dbal": "^2.6",
"fideloper/proxy": "~3.3",
"guzzlehttp/guzzle": "^6.3",
"intervention/image": "^2.4",
"laravel/framework": "5.5.*",
"laravel/tinker": "~1.0",
"league/flysystem-aws-s3-v3": "~1.0",
"predis/predis": "^1.1",
"tymon/jwt-auth": "dev-develop"
},
than run composer update in project root using terminal than its working fine.

Answer 7

I am oblivious to why this worked for me, I saw this in a forum somewhere
I just added this captcha generator to the composer.json file
"mews/captcha": "~2.0.",
added it to all the require package
"require": {
"php": ">=5.5.9",
"laravel/framework": "5.1.*",
"laravelcollective/html": "5.1.*",
"laracasts/flash": "~1.3",
"mews/captcha": "~2.0.",
"guzzlehttp/guzzle": "~4.0"
},
If someone knows why this worked it would really scratch the itch in my brain.

Answer 8

I got this error when I tried running my code outside of the Laravel framework while testing in a stand alone file. It worked for me when I moved it inside a controller.

Answer 9

You can solve this problem to add "mews/captcha": "1.0.1" and "guzzlehttp/guzzle": "~4.0" to your composer.json file. And then you need run composer update command on your terminal.
I have tried on Laravel 4. It works for me.

Answer 10

Try updating your composer to latest version might end sorting your problem. This worked out for me. Ubuntu/Linux users use this tutorial in Digital ocean