Fresh laravel install on server breaks after composer update

Hello everyone,

My hosting supports fresh laravel install and give access to ssh. Now when I update my composer.json from :

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "laravelcollective/html": "5.2.*",
        "baum/baum": "~1.1"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~4.0",
        "symfony/css-selector": "2.8.*|3.0.*",
        "symfony/dom-crawler": "2.8.*|3.0.*"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

To :

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "laravelcollective/html": "5.2.*",
        "baum/baum": "~1.1"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~4.0",
        "symfony/css-selector": "2.8.*|3.0.*",
        "symfony/dom-crawler": "2.8.*|3.0.*"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        },
        "files": [
            "App/Helpers/CmsHelper.php"
        ]
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

Whenever I do this I get a 500 error from the server. Here is the error from composer when I do a composer update :

Warning: Uncaught ErrorException: require(/home/******/******_laravel/vendor/composer/../../App/Helpers/CmsHelper.php): failed to open stream: No such file or directory in /home/******/******_laravel/vendor/composer/autoload_real.php:66
Stack trace:
#0 /home/******/******_laravel/vendor/composer/autoload_real.php(66): Composer\Util\ErrorHandler::handle(2, 'require(/home/s...', '/home/******/s...', 66, Array)
#1 /home/******/******_laravel/vendor/composer/autoload_real.php(66): require()
#2 /home/******/******_laravel/vendor/composer/autoload_real.php(56): composerRequire9880c45eee900dd1d6a35cfa5df3c2fc('7616984cfef25ec...', '/home/******/s...')
#3 /home/******/******_laravel/vendor/autoload.php(7): ComposerAutoloaderInit9880c45eee900dd1d6a35cfa5df3c2fc::getLoader()
#4 /home/******/******_laravel/vendor/laravel/framework/src/Illuminate/Foundation/ComposerScripts.php(30): require_once('/home/******/s...')
#5 phar:///usr/local/bin/composer/src/Composer/EventDispatcher/EventDispatcher.php(255): Illuminate in /home/******/******_laravel/vendor/composer/autoload_real.php on line 66

Fatal error: composerRequire9880c45eee900dd1d6a35cfa5df3c2fc(): Failed opening required '/home/******/******_laravel/vendor/composer/../../App/Helpers/CmsHelper.php' (include_path='.:/opt/alt/php70/usr/share/pear') in /home/******/shormex_laravel/vendor/composer/autoload_real.php on line 66

How can I fix this ? ( NOTE THE FILE IS THERE )

Best regards, Wouter.