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I just downloaded Xcode 6 & played with it a bit.
After switching back to previous version of Xcode and running in simulator, I keep getting this error.
Unable to determine simulator device to boot.
How do we resolve this?
Thanks in advance.
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I've faced same issue and solved by below steps:
1)
Movexcode6-beta into application folder2)
Restartmac and open xcode6-beta from application folder.I just fixed the exact same problem by removing the beta version and rebooting the computer.
In my case I had such a message just because the simulated device was still booting (longer than usually, I guess). Xcode 7.2. (This is not actually an answer to this specific question, but I came here googling the message in the title, so I am writing my note here for if someone else gets the same case as I did)