slack-notification-channel | Laravel Slack notification channel with API token | REST library

I recently performed a rather large update to this web app, and for the most part it went off without a hitch... Until the app tries to send an SMS notification from staging/production.

The upgrade from laravel 7.x to 8.x was quite simple and straightforward. At the same time we also installed Laravel Horizon. Everything went according to plan, and all works fine locally.

When we deploy to staging/production however, queued SMS notifications fail with the following exception:

ReflectionException: Class Http\Adapter\Guzzle6\Client does not exist in /home/forge/dev.example.com/releases/20210609194554/vendor/laravel/framework/src/Illuminate/Container/Container.php:836

Looking in the stack trace we can see that Nexmo is the culprit:

#5 /home/forge/dev.example.com/releases/20210609194554/vendor/nexmo/laravel/src/NexmoServiceProvider.php(150): Illuminate\Foundation\Application->make()

However in our composer.json file we are requiring Guzzle 7 with the following:

"guzzlehttp/guzzle": "^7.3",

It is worth mentioning again at this point, I have no issues sending SMS locally, the main difference between local and staging environments is that locally I use Laravel Valet and Staging uses Laravel Envoyer.

What I've tried so far:

• Changing "guzzlehttp/guzzle": "^7.3" to "guzzlehttp/guzzle": "^6.5|^7.3"
• Running php artisan horizon:purge and php artisan horizon:terminate both manually and in a deployment hook.
• Restarting the laravel horizon daemon on forge.
• trying php artisan queue:restart
• running composer dump-autoload and composer dump-autoload -o
• deleting composer.lock and the vendor/ directory from current/ then running composer install
• Restarting PHP, Nginx, and eventually the entire server :(

and more...

Any help is greatly appreciated

UPDATE Below:

Complete composer.json:

What I mean by "Leaking" is the following. I have an About.vue with its own styling (About.scss) and it's own endpoint "/about". I also have the home page endpoint "/" and its corresponding Laravel blade template (Index.blade.php) with its own styling (Index.scss).

The Problem

The style from About.scss is affecting the Index.scss, and they're not even in the same html file that's returned by the server. And it's like this for my entire website. Everything was completely fine before I updated to Laravel Mix ^5.*.

composer.json

I've been trying to install lorisleiva/laravel-search-string but I keep on getting this error. Need this library for the search functionality. Even composer update gives the same error. (just the problem 2 in case of update). I have added the composer.json down below as well. Hope this will okay. Need some guidance.