unable to boot the simulator launchd failed to respond

Question

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?

Boost

Answer 1

tiendung01023 OP

Aug ’22

I fixed by create a new Simulator: Xcode > Product > Destination > Add additional Simulators > tab Simulators > tab button (+) (in bottom left of screen)

0

Answer 2

pcodrapple OP

Nov ’22

Go to Storage Management > Developer > Delete all the caches . Then open -a simulator

5

Answer 3

mzee777 OP

Oct ’23

File > Open Simulator, select an existing iOS simulator.

I get this error:

Screenshot 2023-10-24 at 5.49.10 am.png

Couldn't figure out why. Help please!

0

Answer 4

Rinchen OP

Feb ’24

This solved the Problem for me:

Go to About This Mac > Storage > Manage > Developer and delete the Xcode Caches folder.

7

Answer 5

AleksandarL OP

Feb ’24

Turning off the WIFI and starting the simulator worked for me.

0

Answer 6

inikishin OP

Mar ’24

It helps me to remove simulators with same device but older iOS

0

Answer 7

bmitioglov OP

1d

Clean XCode cache, Apple logo -> Settings -> Storage -> Developer -> Delete Xcode cache

0