在ubuntu16.04 nginx中使用命令composer install——no-dev上传

每次我运行命令composer install --no-dev我得到这个错误，我使用maatwebsite在laravel作为错误指出，我只是不知道如何修复它。

PHP致命错误:UncaughtSymfony '调试'异常' '组件FatalThrowableError
类'PHPExcel_Shared_Font'没有找到/var/www/laravel/config/excel.php: 18
栈跟踪: <标题> 0/var/www/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap h1> LoadConfiguration.php(60):要求()<标题> 1/var/www/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Bootstrap h1> LoadConfiguration.php (38):照亮' '引导基础' LoadConfiguration - l
>oadConfigurationFiles(对象(照亮' '应用基础),对象(Illumina公司
te ' Config ' Repository) <标题> 2/var/www/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Applicati h1> on.php (203):照亮' '引导基础' LoadConfiguration
->引导(对象(阐明' '应用基础)<标题> 3/var/www/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Console/K h1> ernel.php (268):照亮' '基础应用程序-> bootstrapWith(数组)<标题> 4/var/www/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Console/K h1> Kernel .php(114): Illuminate'Foundation'Console'Kernel->boo in/var/www/laravel/co
nfig/excel.php第182行脚本php工匠优化处理安装后-cmd事件返回er
错误码255

更新:这是作曲家。Json文件内容

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.6.4",
        "laravel/framework": "5.3.*"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~5.0",
        "symfony/css-selector": "3.1.*",
        "symfony/dom-crawler": "3.1.*",
        "maatwebsite/excel": "~2.1.0"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App''": "app/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-root-package-install": [
            "php -r '"file_exists('.env') || 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"
    }
}