Laravel MongoDB"；类db不存在"；错误

我正在尝试安装jensegers-Laravel-MongoDB捆绑包。(https://github.com/jenssegers/Laravel-MongoDB)

当我尝试composer update时，我得到以下错误：

"error":{"type:"ReflectionException","message":"Classs db does not exist","file":"C:''wamp''www''projectname''vendor''laravel''framework''src''Illuminate''Container''Container.php","line":308}} Script php artisan clear-compiled handling the post-update-cmd event returned with an error

我的composer.json文件如下所示：

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "require": {
        "laravel/framework": "4.0.*",
        "jenssegers/mongodb": "*"       
    },
    "autoload": {
        "classmap": [
            "app/commands",
            "app/controllers",
            "app/models",
            "app/database/migrations",
            "app/database/seeds",
            "app/tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-install-cmd": [
            "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": "dev"
}

有什么建议可以解决这个问题吗？