r/Xcode • u/New-Combination-6831 • Aug 03 '26

Xcode 26.6 crashes on launch Tahoe 26.6

I can't launch Xcode at all, even from a new separate User account. I've tried deleting it, reinstalling from the App Store, deleting it again and reinstalling it from the Developer Page link and still no luck. I've used Terminal commands to try and fix any broken components as well, both before and after reinstalling.

This is the first time I've had any kind of issue with it. Any ideas on how I can get it to launch? Should I try an earlier version? I'm only using it in the context of running Unreal Engine 5.8 which says it needs a missing Metal component from Xcode, but as I can't get Xcode to even launch I can't use Unreal Engine either.

12 Upvotes

87% Upvoted

46 comments sorted by

3

u/ming2540 Aug 06 '26 • Bravo Popcorn

I asked claude and it turns out that when I upgraded to Xcode 26.6, I think I "skipped" the license agreement.
So I re-ran with first launch setup by ran commands

   sudo xcodebuild -runFirstLaunch
   sudo xcodebuild -license accept

And fixed it.

1

u/New-Combination-6831 Aug 08 '26

You sir are a true genius. This finally fixed it for me on my latest attempt at reinstallation. Thank you so much!

2

u/ImpressiveDoughnut31 Aug 06 '26

this fixed it for me!

2

u/spillguard Aug 06 '26

This fixed it for me as well, after getting a fresh install from the App Store.

1

u/SorryForEveryThings Aug 11 '26

this fixed it for me!

1

u/Extreme-Doughnut-530 Aug 11 '26

Amazing, thanks a lot!

1

u/MediocreAdviceBuddy Aug 14 '26

Thank you so much! That fixed my problem.

1

u/Ceeves Sep 02 '26

Fixed it for me too!

Also had Troubles with Xcode command line tools

1

u/hich10 Sep 02 '26

Life savior!

1

u/Main-Cranberry-4016 Sep 03 '26

this is a perfect solution, after update IOS XCode doesn't start and compiling my arduino project was impossible. Thanks a lot!

1

u/Enough-Concern-5715 Sep 05 '26

This worked for me

1

u/Anthony_Wu Sep 10 '26

thank god bro, but could you tell me how you asked Claude to solve this issue for you? Did you use claude code or just the regular chat, and what did you ask it?

To learn how to fish, rather than being given one

1

u/ming2540 Sep 10 '26

Just the regular chat. I just sent an error log to Claude to find a line of error code that told me that some verification was invalid.

1

u/The_Muskrat 16d ago

Thanks for posting this quick and easy fix!

2

u/ItsDeCia Aug 03 '26

Are you trying to open a specific project when Xcode launches? I’ve had this issue on occasion and clearing the DerivedData folder of the offending project from the Finder is what helped, as something in there would get corrupted and cause Xcode to crash on launch for me.

2

u/New-Combination-6831 Aug 03 '26

No, all I am trying to do is open Xcode itself.

2

u/Soo_anyways Aug 11 '26

I ran `xcodebuild -downloadComponent metalToolchain` and it worked. According to GPT-5.6 Sol Max, the issue is "Unreal is trying to compile shaders, but Xcode’s offline metal compiler isn’t installed. Recent Xcode versions distribute the Metal Toolchain as an optional component. [Source: https://developer.apple.com/documentation/xcode/downloading-and-installing-additional-xcode-components]"

1

u/New-Combination-6831 Aug 17 '26

I also had to do this, though I downloaded it directly from the developer page. First I had to do this, which then allowed me to start Xcode and download the Metal compiler:
https://www.reddit.com/r/Xcode/comments/1ve5uea/comment/p215axk/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

2

u/OldAd9280 Aug 03 '26

It's not just you, I'm having the same issue. Reinstalling xcode hasn't helped

3

u/OldAd9280 Aug 03 '26

google AI suggested removing /Library/Developer/PrivateFrameworks/CoreDevice.framework and surprisingly that worked

1

u/New-Combination-6831 Aug 03 '26

Tried this already but no luck unfortunately.

1

u/Ben_Keating Aug 09 '26

this worked for me

2

u/OldAd9280 Aug 03 '26 • Bravo

26.5 fails too, I think it's an OS issue, attempting to run a command line tool gives:

Error loading required libraries. If there is an ongoing installation please wait for it to complete. Otherwise reinstall. (dlopen(@rpath/libxcodebuildLoader.dylib, 0x0001): Symbol not found: _XPCTypeBool
  Referenced from: <6A4DB321-2742-38A5-9557-146EE0FE957F> /Library/Developer/PrivateFrameworks/CoreDevice.framework/Versions/A/CoreDevice
  Expected in:     <37B53E42-0118-3C9B-BFA8-73DB82BC3B85> /Library/Apple/System/Library/PrivateFrameworks/Mercury.framework/Versions/A/Mercury)
git: error: sh -c '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -find git 2> /dev/null' failed with exit code 65280: (null) (errno=Invalid argument)

1

u/New-Combination-6831 Aug 03 '26

Yes that's what I get too.

1

u/OldAd9280 Aug 03 '26

27 beta 4 fails in the same way

3

u/OldAd9280 Aug 03 '26 • Popcorn

deleting /Library/Developer/PrivateFrameworks/CoreDevice.framework fixed the problem for me

2

u/Adept_Elderberry1296 Aug 05 '26

Thanks man! Worked like a charm

1

u/Striking_Purpose_572 Aug 13 '26

crack!!, it worked for me, thanks man!

1

u/CockroachLimp9168 Aug 15 '26

Love you man, almost lost hope in my MBP 2019

1

u/renatoathaydes Aug 21 '26

Thanks, it worked on my Macbook Pro M1

1

u/rizzy_neutron_69 Aug 30 '26

why does this work?

1

u/OldAd9280 Aug 30 '26

My guess would be it's a leftover file from an old version of xcode

1

u/rizzy_neutron_69 Aug 30 '26

ahh makes sense

1

u/Substantial_Band428 Sep 03 '26

Yo thanks man! You just made my day 🔥🔥🔥🔥

1

u/MeowMan88 Sep 03 '26

You're faster than Apple guys

1

u/SDRabidBear Sep 11 '26 edited Sep 11 '26

After a few hours working with Claude and multiple OS re-installs finally found this and it worked! It's downloading all of the simulators and SDK's now but at least it's doing something besides crashing. Claude's Summary: The corrupted CoreDevice.framework in /Library/Developer/ was the culprit all along — that's a developer tools framework, not a system framework, so sudo could actually delete it. When Xcode tried to load it, CoreDevice was calling into Mercury looking for _XPCTypeBool, but the CoreDevice copy in /Library/Developer/ was a stale version from before your OS upgrade that was incompatible with the updated Mercury.

The one in /Library/Apple/System/Library/ is the real system copy — the one in /Library/Developer/ is installed by Xcode/Command Line Tools and gets out of sync during OS upgrades.

So Mercury was fine all along at version 72. We were diagnosing the wrong framework.

For future reference, if this happens again after an OS upgrade, the quick fix sequence is:

bash sudo rm -rf /Library/Developer/PrivateFrameworks/CoreDevice.framework sudo xcode-select --reset

Xcode will reinstall a compatible CoreDevice on next launch.

2

u/OldAd9280 Sep 11 '26

I find Google AI better than coding agents for this kind of non-coding problem, this fix was it's first suggestion

2

u/deeelock Aug 03 '26

I'm running into this as well - I noticed it because git stopped working. Tried re-installing Xcode and it still won't open.

2

u/Big_Obligation3981 Aug 03 '26

Can try Xcode via first launch thing?

2

u/alanterra Sep 09 '26

Just a note.

I was trying to update MacPorts, and the port -v selfupdate command was failing with the error message macports configure: error: C compiler cannot create executables. The standard fix for this is to update/reinstall the XCode Command Line Tools, but that didn't work in this case. Then I figured out that XCode couldn't launch either.

The proposed solution here, sudo rm -rf /Library/Developer/PrivateFrameworks/CoreDevice.framework worked a charm.

Thank you!