Unable to determine simulator boot device. - Xcode

Question

I just downloaded Xcode 6 and played a little with it.

After upgrading to a previous version of Xcode and running in the simulator, I continue to get this error.

Unable to determine simulator boot device.

How do we resolve this?

Thanks in advance.

Answer 1

Make sure that there is only one instance of iOS Simulator in the dock.

Answer 2

For me there was a simple answer:

• Open the simulator using Xcode -> Open Developer Tool -> iOS simulator (even if it cannot be started, the application will open).
• Having opened the simulator application, open "Hardware → Device →" Device Management ".
• Add the missing simulators with the plus button (for some reason I’ve been missing).

Answer 3

I ran into the same problem and decided to follow these steps:

1) Move xcode6-beta to the application folder

2) Restart mac and open xcode6-beta from the application folder.

Answer 4

I had the same issue when starting with Xcode 6 beta by selecting iPhone 5s. If I choose iPhone 5 or “resizable iPhone”, then my application will start perfectly.

Answer 5

You will not see the simulator profiles without rebooting OS X. I added the simulator many times when the reboot is over, it is displayed in the list of devices under the simulator panel. I think this is an Xcode 6 Beta bug p>

Answer 6

I think you have 2 simulators working in the dock. Close another simulator and run the project again. This may be helpful for you.

Answer 7

In my case, I had such a message only because the simulated device was still loading (longer than usual, I think). Xcode 7.2. (Actually, this is not the answer to this specific question, but I came here by clicking on the link in the title, so I write my note here if someone else gets the same case as me)

Answer 8

I just fixed the same problem by uninstalling the beta and restarting the computer.