Xcode error connecting to simulator "Software caused connection abort"

Question

When I try to run my project through the Xcode simulator, it keeps giving me the error "Software caused connection abort".

Tried restarting the simulator & Xcode, and I recently deleted the DerivedData folder as suggested in this post about broken playgrounds so that also didn't help.

To me it happened, when sometime back I opened two different Xcode app parallel. Just quitting the simulator and the Xcode and then reopening Xcode solved the issue for me. — BangOperator, Aug 03 '17 at 07:15
Quit all versions of Xcode and Simulator completely. Re-open and run. — nodebase, Aug 05 '17 at 06:37

score 108 · Accepted Answer · edited Feb 27 '18 at 16:50

108

QUICK FIX

This is happening because you have multiple versions of Xcode installed. MacOS unfortunately only supports running one version of Xcode at a time, and it needs to know the location of the currently running version. To sort things out, choose one of the following:

Quit all instances of Xcode and restart it

Try one of the other options below if that hasn't solved it.

Using the command line:

run sudo xcode-select --switch /Applications/your_custom_folder_if_needed/Xcode.app
Restart your terminal and Xcode and it will work just fine.

No-command line users:

Quit all instances of Xcode
Start the instance of Xcode that you want to use
Go to Xcode -> Preferences -> Locations
Select the correct version in Command Line Tools
Done!

edited Feb 27 '18 at 16:50

Hannele

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answered May 31 '17 at 15:21

Gabriel Goncalves

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I'm not getting this problem anymore so I can't confirm that this would fix it, but this answer looks like it would treat the root cause more effectively. Thanks! – Hannele Jun 02 '17 at 12:26
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It's easy to get into this state if using different XCode version (beta, released). Can confirm, both of these work. – lal Sep 06 '17 at 00:22
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Awesome Thanks a ton – Sujit Feb 09 '18 at 14:41
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Remember to close other tools too, like the Simulator for instance. – Matthew Wilcoxson Oct 15 '18 at 14:19

Umit Kaya · Answer 2 · 2017-06-13T04:11:28.667

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It's due to multiple Xcode installed in your system. This is how you make it work:

Quit all running Xcodes
Re-launch Xcode
Go to Xcode > Preferences > Locations
Change to the correct version in Command Line Tools

Clean project and clear Derived data if necessary, then run!

edited Jun 13 '17 at 04:11

answered Jun 08 '17 at 04:55

Umit Kaya

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Just restarting the computer, running the app on an iPhone and then trying the Simulator again resolved it for me: https://forums.developer.apple.com/message/235094#235094 – skofgar Jun 11 '17 at 02:07
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This solution fixed my issue and I too had 8.2.1 and 8.3.2 running in my mac – anoop4real Jun 21 '17 at 05:22
Hi, I have this same issue but there are no multiple versions in my Command Line Tools in Xcode > Preference > Locations, what else can I do? – mding5692 Feb 27 '18 at 05:59
Can you quit and re-launch Xcode. Will it happen again? – Umit Kaya Feb 27 '18 at 15:44

score 11 · Answer 3 · answered Jul 26 '17 at 10:29

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In my case quitting and re-launching given Xcode was enough. I had two Xcodes, stable and beta.

answered Jul 26 '17 at 10:29

Chuck Boris

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score 0 · Answer 4 · answered Apr 13 '18 at 09:57

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For me, restarting the Mac OS worked (multiple times).

answered Apr 13 '18 at 09:57

Deepak

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Xcode error connecting to simulator "Software caused connection abort"

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