Cant launch iOS app with Instruments on device

I had the same problem, my solution was to initiate instruments from XCODE.

Xcode 11:

1. Run the app on simulator

2. Open Debug Navigation (Command + 7)

3. Click on cpu

4. Click on “Profile in Instruments”

Xcode 3.2.5

1. Launch XCODE

2. Select Device, or Simulator

3. Up on top Click RUN > RUN WITH PERFORMANCE TOOL > LEAKS

This allowed me to test without giving me that error. This is in XCODE 3.2.5 that I did this in .. it might be a little different if you are using 4.x

I had the same problem. I didn't solve it, but an easy workaround is to launch the app yourself and then attach to it from the Attach to Process... command in the Target menu in the Instruments window.