Couldn't register xxx.xxx with the bootstrap server. Error: unknown error code.

今天用iphone實機來debug， 

 後來發現程式居然一直傳不上去手機 

 明明就沒動到什麼 而出現以下error

Couldn't register 我的package名稱 with the bootstrap server. Error: unknown error code.
This generally means that another instance of this process was already running or is hung in the debugger.

後來查了查 原來只要將 你的iPhone重新開機就可以了