我用composer安装的laravel为什么打开的时候就会报错

1设置php.ini，方便安装　　在从官网下载Composer-Setup.exe安装程序后，在安装过程中会碰到几个麻烦的地方：　　1.找不到扩展dll文件，修改php.ini文件内extension_dir参数　　2.browscap未找到，修改php.ini文件内browscap参数　　3.SSLdll未找到，修改php.ini文件内";extension=php_openssl.dll",去掉前面“;”　　正确的安装画面，如下：　　2使用Composer中文镜像网站，替代国外网站　　当你安装完Composer后，使用时，缺发现不能下载包，这是一个众所周知的原因。　　所以，我们要什么国内的镜像站点进行代替，常用方法有两种：　　1.修改全局配置：全局配置的文件一般放在C:\Users\XXX\AppData\Roaming\Composer\config.json；　　{"config":{},"repositories":[{"type":"composer","url":"/repo/packagist/"},{"packagist":false}]}　　2.修改当前配置：即项目当前的composer.json文件；　　以laravel项目的composer.json配置文件为例：　　{"name":"laravel/laravel","description":"TheLaravelFramework.","keywords":["framework","laravel"],"license":"MIT","type":"project","require":{"laravel/framework":"4.2.*"},"autoload":{"classmap":["app/commands","app/controllers","app/models","app/database/migrations","app/database/seeds","app/tests/TestCase.php"]},"scripts":{"post-install-cmd":["phpartisanclear-compiled","phpartisanoptimize"],"post-update-cmd":["phpartisanclear-compiled","phpartisanoptimize"],"post-create-project-cmd":["phpartisankey:generate"]},"config":{"preferred-install":"dist"},"minimum-stability":"stable","repositories":[{"type":"composer","url":"/repo/packagist/"},{"packagist":false}]}