Laravel 5：调用未定义的函数Illuminate \ Foundation \ Bootstrap \ mb_internal_encoding（）

I am using https://github.com/bestmomo/laravel5-example and just cloned it. But i got this message. Googled everywhere but no results. Perhaps someone experiencing this? I am newbie to L5

had the same problem, solution is to enable the mbstring php extension: https://laracasts.com/discuss/channels/general-discussion/call-to-undefined-function

In my case (AMPPS), I had to disable and reenable it + apache restart.