将Laravel站点移动到Localhost时出错

I am new in laravel i have a laravel site in my test server.now i want to transfer that site into localhost. i have changed database connection into app/config/database.php

but when i run the site it gives me an error

my composer.json code looks like this

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "require": {
        "laravel/framework": "4.2.*",
        "cartalyst/sentry": "2.1.*",
        "thujohn/pdf": "dev-master"
    },
    "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 optimize"
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ]
    },
    "config": {
        "preferred-install": "dist"
    },
    "minimum-stability": "stable"
}

Please help me to run the site in my local system

Begin by installing this package through Composer. Edit your project's composer.json file to require dinesh/barcode.

"require": {
    "laravel/framework": "5.0.x",
    "dinesh/barcode": "5.0.*@dev"
}

Next, update Composer from the Terminal:

composer update