Composer update not installing the entirety of Laravel app - laravel

Question

On deploying my application through Laravel Forge, I'm presented with the following errors:
Fatal error: Class 'Illuminate\Support\Arr' not found in
/home/forge/toono.co/vendor/laravel/framework/src/Illuminate/Support/helpers.php
on line 151
This is after the composer update command has ran. I have SSH'd into the directory and low and behold, the file Arr.php doesn't exist.
The code is pulled from the master branch in BitBucket, and then the following lines are executed on the production server:
cd /home/forge/default
git pull origin master
composer install
php artisan migrate --force
Composer.json:
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": [
"framework",
"laravel"
],
"license": "MIT",
"require": {
"laravel/framework": "4.2.*"
},
"require-dev": {
"way/generators": "2.*",
"fzaninotto/faker": "1.4.*#dev",
"barryvdh/laravel-debugbar": "1.*",
"flynsarmy/csv-seeder": "1.0.*"
},
"autoload": {
"classmap": [
"app/commands",
"app/controllers",
"app/models",
"app/database/migrations",
"app/database/seeds",
"app/tests/TestCase.php"
]
},
"scripts": {
"post-install-cmd": [
"php artisan clear-compiled",
"php artisan optimize"
],
"post-update-cmd": [
"php artisan clear-compiled",
"php artisan debugbar:publish",
"php artisan optimize"
],
"post-create-project-cmd": [
"php artisan key:generate"
]
},
"config": {
"preferred-install": "dist"
},
"minimum-stability": "stable"
}
Composer.lock:
"require": {
"codesleeve/stapler": "~1",
"laravel/framework": "~4",
"php": ">=5.4.0"
}
Why has composer update missed that file? After a local update and even on the master branch in Github, Arr.php is there?
If I am missing any necessary code that you require, please let me know.
Any help would be greatly appreciated.

Answer 1

I solved this by deleting composer.lock and the vendor folder within the production server. I then used composer update.

Answer 2

I solved this by ssh'ing into the box via commandline (ssh forge#ip.of.server)
if you don't know how to ssh into the server, you go to forge -> the server -> SSH Keys.
There you add your public key (if you have not setup ssh keys follow this guide: https://help.github.com/articles/generating-ssh-keys).
If you have ssh keys setup, you simply open terminal and paste the following command and run it; "pbcopy < ~/.ssh/id_rsa.pub", this will copy your public key to your clipboard and you can simply paste that into the ssh key field in forge.
Now i can ssh into the server.
I then navigated to the default folder (cd /home/forge/default) and ran "composer update"
It updates everything and it worked after that.