No crash here but application grinds to a halt, using AVAudioSession and AVAudioPlayer. App execution on iOS 12, 13 simulators immediately logs: 2020-12-30 15:07:45.125612+0100 HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range 2020-12-30 15:07:45.125793+0100 HALB_IOBufferManager_Client::GetIOBuffer: the stream index is out of range 2020-12-30 15:07:45.137752+0100 [aqme] AQME.h:254:IOProcFailure: AQDefaultDevice (1): output stream 0: null buffer 2020-12-30 15:07:45.137985+0100 AQMEIO_HAL.cpp:1774:IOProc: EXCEPTION thrown (-50): error != 0 2020-12-30 15:07:59.535460+0100 AQMEIO.cpp:179:AwaitIOCycle: timed out after 15.000s (0 1); suspension count=0 (IOSuspensions: ) 2020-12-30 15:07:59.535868+0100 CA_UISoundClient.cpp:241:StartPlaying_block_invoke: CA_UISoundClientBase::StartPlaying: AddRunningClient failed (status = -66681). After the 15 second timeout the app continues running until the next call to AVAudioSession or AVAudioPlayer. On iOS 14, everything is fine. I hope this does not occur on real devices but could not test that.

Please note that I am NOT using Cocoapods and simply drag-install the Firebase frameworks manually into Xcode, and still the same warnings appear. This means it's probably not a Cocoapods issue.

Same here (Xcode 12.4, 12D4e) , especially immediately after starting up my computer (fastest Mac mini 2018) which is switched off during the night. It occurs to me: • beach balls occur even without any file or project open. Xcode just stops responding while seemingly doing nothing. No disk, CPU or network activity can be seen. • if I wait it out (for instance 10 minutes) the beach balls will eventually finish and Xcode continues to work as normal. • if I wait it out (which is unbearable), the beach balls mostly will not come back until the next morning. • if I force quit Xcode, sometimes a couple of times in sequence, the problem is gone in most cases. • when Time Machine is doing stuff, beachballs take much longer to disappear. • unpairing all devices and re-adding them does not seem to help. • not using network but only lightning connections for devices does not seem to help. • cleaning out all caches, derived data, etc does not help. It's just terrible. I am afraid to open a new project or switch projects in Xcode because that seems to mean another early lunch break. I am afraid to open a storyboard or nib file because that may trigger another forced 10 minute wait.

Same problem, did not receive any e-mail but Testflight build was rejected. However, the accepted answer (clicking on the red badge) did not lead me to the resolution center (even though the URL made it seem so). I found the resolution center under My app - app store - version history - tap resolution center on the top right.

Update: when I delete my developer account in Preferences - Accounts, Xcode no longer crashes when opening the Organizer. This means however that automatic signing and uploading a build no longer works, but at least it's some info that may lead to the solution.

Same assertion failure here in the logs.

I have found a work around / fix: • download and install both Xcode 12.4 and 12.5 from the developer downloads page • launch 12.4, then in the Organizer window one-by-one select all of your apps in the drop down box while “Archives” is selected. • quit 12.4, launch 12.5, open the Organizer window and it should no longer crash now.

The suggested workaround works, but the problem often returns and then the workaround has to done once more. For now, I work and build in Xcode 12.5, and then submit the build using Xcode 12.4.

Setting the launch screen also fixed it for me.

It seems to be fixed now. I guess Apple changed something in the backend for fetching app data / apple id data. Xcode no longer crashes in the organizer for me.

Same here but with locally stored mp4 file. On iOS 14 works fine, on iPadOS 14 there is only audio but no image. After moving the app to the background and coming back, the image suddenly appears,

Same here, I followed every tip I could find here and on other websites, but still the folder / files are not showing up visibly. Problem: ubiquitous container works, files can be read and written, but are not showing up in macOS Finder, nor in the Files app on iOS devices. macOS 11.5, iOS 14.7, Xcode 12.5.1 I have tried: everything stated here: https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/FileProvider.html everything stated here: https://developer.apple.com/library/archive/qa/qa1893/_index.html every variation of info.plist values for NSUbiquitousContainers (eg. both the container id and my bundle id) every variation of info.plist values for NSUbiquitousContainerIsDocumentScopePublic every variation of info.plist values for NSUbiquitousContainerName every variation of info.plist values for NSUbiquitousContainerSupportedFolderLevels creating new containers changing the apps' version and build numbers, including only increasing CFBundleShortVersionString. changing the apps' bundle identifier deleting and reinstalling the app reboots of used devices switching off/on iCloud drive for the user on all devices It is driving me crazy. Who can help?

Same here, 14 days to go but no renewal button. Submitted a support ticket. Then I found out that SHIFT-refreshing the membership page did the trick for me. All of a sudden the orange buttons to renew were there at the top of the page.

Same here, however SHIFT-refreshing the membership page did the trick for me. (After wasting an hour searching for an answer).

Same here, I am trying to add GameKit to my MessagesExtension but it will return "The requested operation could not be completed because this application is not recognised by Game Center." I have added the Game Center capability and in App Store Connect I have added a Leaderboard, but still the same error.