今天使用微信时，遇到无法debug的情况  搜索stackflow找到答案

圆满解决 

That is really annoying. This error happens in a number of different situations. Sometimes restarting the Xcode, fixes the problem. If not, follow these steps:

Disconnect your device.

Delete the app from your device.

Quit Xcode (Do not just simply close the window, quit it)

Delete derived data folder (~/Library/Developer/Xcode/DerivedData/-gbrvhlvwmpiobxdujegtghggrffp - or something like that)

Now start Xcode once again, connect device and run the project. It should work fine.

from DhilipSiva