I recently installed the beta of Xcode Version 6 in OS X Mavericks, with which comes the iOS simulator for iOS 8. I've managed to successfully run from Xcode 6 beta on a device with iOS 8 Beta, but opening the simulator always get the same error I have tried to change the hardware version of iPhone 4s, iPhone 5, ... in the simulator and still gives the same error: "Unable to boot the iOS Simulator".
I'm working with Xcode 5.1 at the same time in Mavericks, any suggestion to solve this? Is a possible problem for run this simulator in Mavericks because is only for OS X 10.10? Thanks.
After I found some solutions on the web, a combination of procedures worked for me:
Close Xcode and iOS Simulator (and all related applications)
Install (or reinstall) Xcode6-Beta to Applications folder (direct from the .dmg file)
Open Xcode6-Beta and go to Xcode -> Preferences -> Locations -> Command Line Tools and select "Xcode 6.0" (be sure that you've selected the one in Applications folder)
Launch the iOS Simulator and go to iOS Simulator -> Reset Content and Settings...
Close all the applications and restart your mac (I unchecked "Reopen windows...")
Open Xcode6-beta and test the iOS Simulator
Good luck
I also had this problem and found the solution by doing following steps:
Initially i downloaded Xcode 6 library in Documentation section under the path Xcode --> Preferences --> Downloads and restart my xcode but didn't solve my problem.
Downloaded and installed the iOS 7.1 Simulator under the path Xcode --> Preferences --> Downloads.
Restart xcode again and the problem solved.
I am facing same issue again next morning.
Unsetting the DYLD_INSERT_LIBRARIES variable solves my problem:-
Open terminal and type "sudo vi /etc/launchd.conf" command and press Enter
Press I "Insert" mode and change this
"setenv DYLD_INSERT_LIBRARIES /usr/lib/libimckit.dylib"
to this
"unsetenv DYLD_INSERT_LIBRARIES /usr/lib/libimckit.dylib"
and press esc to exit from insert mode.
Save changes by typing ":wq" Press Enter
Reboot your system and problem soloved.
Prior to that I didn't find any iOS version in front of each listed devices
but after installation or by unsetting DYLD_INSERT_LIBRARIES variable I found the same in front of each device.
I solved by removing and re-adding the simulators see screenshots here.
https://stackoverflow.com/a/25387715/1565615
I don't believe your issue is related to running Xcode 6 in Mavericks, as I encountered the same error on OS X 10.10.
After a bit of toying around with XCode and the iOS Simulator, the only fix I found was simply restarting the computer, and the error hasn't appeared since.
Try a reboot and then see if you can get things up and running.
(On a side note, after restarting just XCode (not the OS), I lost the option to run on the simulator at all—the reboot also fixed this problem, if anyone here encounters anything similar).
In Xcode go to the Xcode menu->Open Developer Tool - IOS Simulators. Choose simulator and then go hardware->device->manage device.
If the troubled device shows in the left column, delete it. Then add the device back from the '+' button. If it wasn't there in the first place, simply add it using the '+' button.
I had previously deleted ~/Library/Developer/CoreSimulator/ directory and the only command that worked for me is xcrun simctl erase all. Perhaps you might want to give this a try.
No need to download a new ios version. All you need is to go to About this Mac > Storage > Manage > Delete XCode Cache. And, it works for me
In latest OS version
About this Mac > Storage > Manage > Developer > select Xcode cache > Click delete button
I've faced same issue and solved by below steps:
1) Move xcode6-beta into application folder
2) Restart mac and open xcode6-beta from application folder.
i too had the same issue, but solved by installing the required simulators (Xcode > Preferences> downloads > install simulators)
This happened to me running the simulator on both Xcode 7 and 8 on El Capitan. The only thing that worked was disabling System Integrity Protection (https://apple.stackexchange.com/a/208481/86757).
I tested an awful quantity of solutions and the only one which worked for me was disabling root protection through Recovery Mode. I tested it with XCode 7.3, it's possible that this approach may work for XCode 8.
Reboot and hold the keys cmd + R prior to show the loading view with Apple Logo
When you are on Recovery Mode, go to Menu and choose Terminal
Type csrutil disable
Reboot the machine and run the simulator again.
I am adding this answer as it seems to be slightly different from the others.
Due to working on an older project I needed to download and run Xcode 7.3 and load the project in simulator - this yielded the "Unable to boot the iOS Simulator" error.
I completed all the above suggestions and none of them worked (reset simulator setting, restarted, deleted and reinstalled Xcode, reset the simulator location, restarted again etc)
In the end the issue was that I was trying to load the iPhone 5 (10.0) simulator on Xcode 7.3.
You can see here the Apple release notes for Xcode 7.3
Xcode 7.3 requires a Mac running OS X 10.11 or later.
Xcode 7.3 includes SDKs for iOS 9.3, watchOS 2.2, OS X version 10.11.4, and tvOS
9.2.
As you can see Xcode 7.3 doesn't include an SDK for iOS 10.0
This meant as soon as I loaded the simulator with iPhone 5 (9.3) it worked immediately.
I would therefore recommend when approaching this issue not to get railroaded (as I did) in thinking that something is wrong with the system before checking the basic things.
Note: It is also worth noting that the simulator must be configured to the Xcode version being used. This can be set in
Xcode -> Preferences -> Locations -> Command Line Tools
and also using the command line:
sudo xcode-select --switch /Applications/Xcode_7.3.app/Contents/Developer
*change the Xcode version to the new one you want to use
one of the reasons could be you might deleted /private folder.
you can try with following commands
sudo mkdir /private/tmp
sudo chmod 1777 /private/tmp
Following are the steps for solved above issue:
Search launchd.conf file in your mac
If not found then create from Terminal with help of command
~ user$ sudo touch /etc/launchd.conf
Terminal will ask you machine password
Then Open created file with help of command for EDIT, if terminal give you error as permission failed
~ user$ sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/launchd.conf
Open file manually from /etc/launchd.conf (Shift+cmd+g) and enter /etc/ (TextEdit software)
In file "DYLD_INSERT_LIBRARIES" flag replace with "ZZ" and save it.
Restart your machine.
Xcode will defiantly works.
This error indicates an error starting up launchd_sim when booting the simulated device. In and of itself, it does not indicate the actual cause. You can look in ~/Library/Logs/CoreSimulator/CoreSimulator.log for more information about the error (including the error reason).
Possible causes:
On OSX 10.9 and earlier, DYLD_INSERT_LIBRARIES could be set by 3rd party applications. On later versions, invalid DYLD_INSERT_LIBRARIES are ignored instead of resulting in an error.
Usage of older simulator runtime DLC with Xcode 7 betas. Newer versions of Xcode ignore these older DLC.
If you need additional help, please provide that additional datum.
Just check your simulator's iOS version. I fought with this error for 2 days and tried everything. Once I run the project on the simulator with iOS version that my Xcode supports, it worked sadly... :/
I quit everything and restarted the Mac. That's all. Its worked like charm!!
I don't know why, but this happened to me when I had Charles Proxy's throttling turned on.
I didn't have to run Xcode again or clean anything. Just disabling the throttling allowed the simulator to work again.
I also clicked on details, but this was all that I got:
Details
Unable to boot the Simulator. Domain: NSPOSIXErrorDomain
Code 60
Failure Reason: launchd failed to respond.
This might be related a known Xcode 11.2 issue:
Third party “endpoint security” software may cause slow simulators, system freezes, or prevent debug processes from running in simulators reliably. This sometimes manifests as debugserver disconnections or simulator applications receiving a SIGKILL signal. (55853555)
Workaround: Uninstall the third party software.
Though I was seeing this error on 11.1. Yet Apple may have just not realized this was an issue on 11.1 as well ¯_(ツ)_/¯
I have solved this issue using following steps:
Xcode -> Preferences -> Location -> Derived Data -> Delete your project folder.
I got this error on OS Catalina, Xcode 11.
I solved this by simply quiting simulator and Xcode, and then start Xcode and run your application.
1. Quit Xcode and Simulator if running.
2. Remove customised settings setup
defaults delete com.apple.Xcode
3. remove configuration folders
rm -rf ~/Library/Application\ Support/Xcode
4. Quit the terminal and run Xcode again.
Resetting the simulators fixed the issue for me. Run the below
Fastlane command to reset all simulators,
fastlane snapshot reset_simulators
Please ensure you have closed Xcode & simulator before running the command.
Fastlane is an Android & iOS deployment automation tool.
I just simply follow the below steps and the issue is resolved...
Go to About This Mac > Storage > Manage > Developer >
Select Xcode cache > Delete the cache
Now try to open the simulator again and it will work... In case if above steps did not work just try to do the same with s
Late answer, but it maybe helpful to someone. I tried all the solutions provided in this and related posts and neither of them worked.
I am using OSX(version 10.10.3) and Xcode 6.2. To fix this issue I followed the following steps :
Delete all xcode and simulator related files using AppCleaner.
Restart Mac.
Open Disk Utility app from applications.
In Disk Utility app; click on button Verify Disk Permission for your Macintosh HD (there will be some warnings displayed; I think /private/tmp is cause of this issue).
In Disk Utility app; click on button Repair Disk Permission for your Macintosh HD.
Re-install Xcode; now it should work.
More info : How to fix Xcode error ‘Unable to boot iOS Simulator’.
This may helpful
Open simulator with 4s
Click on menu- iOS simulator
Click on Reset content and settings...
Force close the simulator and run app.
I am new to Xcode.
Recently Xcode on machine is broken.
I am getting error "Unable to boot up iOS simulator"
I tried lot of steps mentioned on stackoverflow and blogs but couldn't get it working.
I am hoping reseting Xcode will fix the problem. Even after uninstalling and reinstalling, Xcode is having previous state.
Is there any way to reset Xcode along with simulators ?
You will need to remove the Xcode.app data from ~/Library/Developer, which can be done from the command line (when Xcode is not running):
rm -rf ~/Library/Developer
You will then need to re-download the SDKs and Documentation from with Xcode. You might also want to check that the Command Line Tools are set-up from Preferences > Locations.
There is no need to reinstall Xcode.app, unless it's become corrupt, as nothing should ever write into the app bundle.
You might want to look at ~/Library/Application Support/Xcode as well, but on my system that folder is empty.
I'm getting the error "Could not allocate a resource" when I try to run on any of my devices. I've seen this as a possible fix:
sudo rm -rf /var/db/lockdown/
I've tried that and restarted my machine a handful of times, but no luck. I also tried changing USB ports. I've reinstalled Xcode as well after uninstalling with AppCleaner.
In addition to the error, whenever I connect a device it asks me "Trust This Computer?"
This is occurring on an iPhone 5 and iPhone 6+ with lightning, as well as an iPad 3 with the old style connector.
[Updates]
I've now also reinstalled iTunes to no effect.
Also reset PRAM and SMC.
After you delete that folder, you need to recreate again and make proper permissions, because iTunes need rw rights to that folder:
sudo mkdir /var/db/lockdown
sudo chmod go+w /var/db/lockdown
without having iTunes open. Then everything should be fine.
Also keep in mind the same operation may be required for /private/var/db/lockdown [a mirror]
If you moved and old Mac to a new one, make sure /var/db/lockdown/SystemConfiguration.plist contains your mac actual UUID . Generally it is not recommended to delete a system folder, anyway, without really knowing what you do. ;) Actually I replicated your problem moving /var/db/lockdown to another location, starting iTunes, getting error. Then recreate etc.
On our build system, we need to preserve multiple Xcode versions in order to also build older projects. We duplicate the Xcode app folder for every major Xcode release (from within Finder).
However, after duplicating the Xcode 6.1.1 folder, I couldn't start the app. After double-clicking on the duplicated folder (Xcode-6.1.1.app), it briefly showed the "Welcome" screen, then immediately closed it and showed an alert saying:
/Applications/Xcode-6.1.1.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/dyld_sim is not owned by root.
The original Xcode.app can be opened normally. I could reproduce this problem on both Mavericks and Yosemite.
Has anyone seen this? Any ideas how to make the duplicated Xcode working? Thanks!
Open Terminal and just type this code
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer
enjoy multiple version of xcode :)
type following command in terminal:
The xcode-select commands did not work for me. So I deleted that copy I made with the Finder, and used the free Duplicate (which copies permissions and other metadata correctly when it makes the duplicate) to copy it from a backup. After that it launches flawlessly.
I fixed it with chown:
sudo chown -R root /Applications/Xcode6.1.1.app/
I try to develop app for iOs with MAC OS X Mavericks, but I haven't bought a mac, I virtualize it.
After download and install Xcode 6.1, I connect my iPad 2 on iOs 8.1 but, when my computer "copying symbol files" I've error after a long time.
The error is
Unable to copy symbols from this device This device has a version of iOs different from that of this installation of Xcode. In order to
copy the information needed to work with this device, Xcode must be
run by a user with read/write access to:
"/Users/Lortedo/Library/developer/Xcode/iOS DeviceSupport/8.1
(12B410)/Symbols/usr/lib/dyld"
I've been in the folder and I saw the folder dyld wasn't here. So I create it manually. Too I've give the chmod 777 for all the folder mentionned.
Thanks :)
Lortedo
Check also your harddisk. In my case, it was simply full. After deleting stuff and getting some free space, it worked fine for me.
I had to make some space on my physical harddisk, uninstall xCode, remove ~/Library/Developer/ folder, reboot my VM, empty Trash, reinstall xCode.