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Just updated from Xcode 6 Beta 3 to Beta 4 and everything seems to build fine but when the simulator tries to start up I get:

An error was encountered while running (Domain = com.apple.CoreSimulator.SimError, Code = 146)

It was building fine on Beta 3 so I'm assuming this might be a Beta 4 bug but thought I'd throw this out there just to make sure. Any ideas?

TenaciousJay
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3 Answers3

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I quit both Xcode and the simulator and then restarted. These steps solved the problem.

Grendel2501
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I had issues as well when I first updated. I did not get the same error as you. However, I was able to get things working by deleting my Pods (the project uses Cocoapods) and reinstalling them. I also quit and restarted Xcode as well as the Simulator. I'd also try restarting your computer. Good luck.

Austen Chongpison
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I seemed to get this working again in Beta 4 by following instructions from the following question:

Error opening iOS Simulator with iOS 8 beta version: "Unable to boot the iOS Simulator"

I had to reset a few times and had to do some of the steps multiple times, but my program now builds and runs on the simulator.

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TenaciousJay
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