unable to boot the simulator launchd failed to respond

Developer Tools & Services Xcode
luca.davi OP
Created Oct ’19
Replies 22
Boosts 3
Views 53k
Participants 40

After I updated to Mac OS Catalina I'm no more able to run the simulator. I always get this: "Unable to boot the Simulator - launchd failed to respond".
I'm running

Mac OS 10.15 Catalina

Xcode 10.3


I can't update to Xcode 11 (anyway my collegue installed Xcode 11 and he's getting the same error too)


I already try these:

- Simulator/Hardware/Erase all contents and services... (the result was a black screen on simulator and nothing happened)

- Delete all simulators and download them again

- /private/tmp directory

sudo mkdir /private/tmp 
sudo chmod 1777 /private/tmp


- I tried this

xcrun simctl shutdown all  
xcrun simctl delete $(xcrun simctl list | grep -o '[0-9A-F]\{8\}-[0-9A-F]\{4\}-[0-9A-F]\{4\}-[0-9A-F]\{4\}-[0-9A-F]\{12\}' | xargs)
xcrun simctl delete unavailable


Nothing seems working...

The simulator looks working in the morning, than after few builds it stop working.


Ideas?

Replies  22
Boosts  3
Views  53k
Participants  40
Claude31 OP
Oct ’19

A first simple solution may be to reboot the Mac. Just try it.

0
marcmlynarczyk OP
Oct ’19

Add new Simulator in Manage Devices then try again.

4
chris@imagin8.co.za OP
Nov ’19

Easiest method without restarting your mac would be to just clear the derived data for your project. Go to Xcode -> Preferences -> Locations -> Derived Data (Click the little arrow) -> Delete the folder for your project.

18
luca.davi OP
Nov ’19

Thanks marcmlynarczyk but this doesn't solve the problem.

0
luca.davi OP
Nov ’19

Thanks Chris. This sometimes solves the problem. The problem randomly cames out again..... I'm having a lot of problem after updating to Catalina.. It looks Windows Vista......

1
khalidyaseen OP
Jan ’20

I am facing the same issue and the error detail message I am getting is


Unable to boot the Simulator.Domain: NSPOSIXErrorDomainCode: 60Failure Reason: launchd failed to respond


Tried deleting derived data and also restarting both mac and xcode.


Please help me out if anyone got a solution

0
Claude31 OP
Jan ’20

If that may help, so here had to restart its wifi router…


https://stackoverflow.com/questions/53079949/unable-to-boot-the-simulator-launchd-failed-to-respond-xcode-10-0

1
luca.davi OP
Mar ’20

The company I'm working for has locked some apple service from firewall. I think this is the problem. I don't know which is the service that cause this problem but if you disconnect the Mac from any network everything should work.
I think that Xcode call some apple service for verifing something (or for saving some usage data 👿) and the call to that service go in timeout

1
arinzehills OP
Mar ’22

In my own case i move mine to the trash bin and i try relaunching the simulator and it worked

0
Lucas_carinhanha OP
May ’22

🇬🇧🇺🇸 Remove node_modules with sudo rm -r node_modules and run yarn

🇧🇷🇵🇹 Remova o node_modules com o comando sudo rm -r node_modules e rode o yarn

1
henry_g OP
Jul ’22

I had the same issue and tried every solution proposed in this article until now. For me it worked to reset all my simulators. I did it with fastlane, which I installed with homebrew. After installation I ran:

fastlane snapshot reset_simulators

The tool deleted all my existing devices and created new ones. It solved the issue for me.

4
yanthorpes OP
Jul ’22

Thanks @henry_g, i had the same issue, and fastlane snapshot reset_simulators did the job !

2
stefan_kuehn@gmx.net OP
Jul ’22

This worked for me: https://www.youtube.com/watch?v=38MIOYZOcHg

20
Surendra477 OP
Aug ’22

The best and easy way to solve this issue is to open a simulator in the top you will get an option file and then click on the open simulator option and select the device which you want to start your development

0
cntoss OP
Aug ’22

Fixed by deleting xcode cache

3
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