Laravel 5.4 Class 'GuzzleHttp\Client' not found in TransportManager.php (line 185)

Question

Let me explain first what I'm trying to achieve 1. User submits a form requesting membership, app sends a mail to user acknowledging user's request 2. Admin approves or denies the request, app sends mail to user notifying them

With mailtrap, i have been able to make this work locally. Moving to production, I have switched to using Sparkpost following the steps in sending mail with sparkpost tutorial But I keep getting the error

Class 'GuzzleHttp\Client' not found in TransportManager.php (line 185)

I can see the guzzle folder inside vendor folder after running composer require guzzlehttp/guzzle

"require": {
    "php": ">=5.6.4",
    "guzzlehttp/guzzle": "^6.3",
    "laravel/framework": "5.4.*",
    "laravel/tinker": "~1.0"
},

I just don't understand why i'm getting this error or how to fix it. Need help resolving this issue

Answer 1

You may want to ensure the you first have a require './vendor/autoload.php included (which should be the case in Laravel by default).

If autoload.php is already included and you still get this error, then according to this filed bug - https://github.com/SparkPost/php-sparkpost/issues/37, you will need to manually run

php composer.phar require guzzlehttp/guzzle

Answer 2

Finally made my code work by doing the following

Initially i ran composer require guzzlehttp/guzzle to add guzzlehttp/guzzle to require section of composer.json file

Secondly, I ran composer update

Lastly, I uploaded my files from my local server to the production server. Then I added use GuzzleHttp\Client to my mail controller and everything worked well.

I think what i was missing earlier was not running composer update after requiring guzzlehttp/guzzle