Message from debugger: failed to send the k packet

Question

I am developing an app in Xcode 6.4 and it runs on the simulator, but when I try to run it on my iPhone(iOS 8.4) it crashes.

The message in the console is:

Message from debugger: failed to send the k packet.

Can someone help with this?

Answer 1

I had this problem just now and just fixed it with

rm -rf ~/Library/Developer/Xcode/DerivedData/* ; rm -rf ~/Library/Caches/com.apple.dt.Xcode/* 

in terminal/shell/bash.

Not sure what it is exactly, but I'd toss it in the 'another XCode fart' category.