Unable to guess the mime type as no guessers are available (

Unable to guess the mime type as no guessers are available (Did you enable the php_fileinfo extensio，

原因是没有开启php的php_fileinfo扩展，开启即可。

extension=php_fileinfo.dll

找到php.ini文件，搜索到php_fileinfo，去掉前面的分号，然后重启服务器apache。nginx下同理。

如果还有上述报错请查看

https://stackoverflow.com/questions/23065703/laravel-4-no-guessers-available-issue

需要重启下 php artisan serve 

再次上传即可