"'Modules\Admin\Providers\AdminServiceProvider' not found"

文件存在 Modules\Admin\Providers\AdminServiceProvider.php
本地测试所有通过，布署到服务器就不行了，昨天中午折腾到现在，各种搜索尝试，可以发贴请教一下大家看能不能给一点解决问题的思路，谢谢大家！

Modules为模块包

布署在服务器后， composer dump-autoload 运行显示

composer dump-autoload
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Continue as root/super user [yes]? yes
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi

In ProviderRepository.php line 209:

  Class 'Modules\Admin\Providers\AdminServiceProvider' not found  


Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1

访问网址显示：

/cms/vendor/laravel/framework/src/Illuminate/Foundation/ProviderRepository.php
        if (! is_writable($dirname = dirname($this->manifestPath))) {
            throw new Exception("The {$dirname} directory must be present and writable.");
        }

        $this->files->replace(
            $this->manifestPath, '<?php return '.var_export($manifest, true).';'
        );

        return array_merge(['when' => []], $manifest);
    }

    /**
     * Create a new provider instance.
     *
     * @param  string  $provider
     * @return \Illuminate\Support\ServiceProvider
     */
    public function createProvider($provider)
    {
        return new $provider($this->app);
    }
}

Arguments
"Class 'Modules\Admin\Providers\AdminServiceProvider' not found"