This is the first time I have been facing this strange issue
Whenever I click on a variable, function name, etc., that is what shows up in the Quick Help section of Xcode:
Error Domain=com.apple.DNTDocumentationSupport Code=0 "disk I/O error" UserInfo={NSLocalizedDescription=disk I/O error}
I have no idea what might be causing this issue, but it seemed to have started to occur when I updated my Xcode to version 9.4.1.
On Stack Overflow, I have only found one Q&A with the same error message, but I have restarted Xcode many times, but to no avail. Does anyone know how to fix this error?
The main reason why this happens is usually because the Xcode documentation is missing or a new version of it is being downloaded in the background for you. For Xcode 9.4.1, you can check if the documentation has been downloaded and is in the correct place. Please do the following:
Open Terminal
Type cd ~/Library/Developer/Xcode/DocumentationCache/
Type ls -al
Find the right directory for your documentation and Xcode versions, in this case v33 and 9.4.1, respectively.
Type cd v33/9.4.1/DeveloperDocumentation.index
Type ls -al
Find file store.db on the generated file list
This database file should have the size of 17960960 bytes or roughly 18 Mb.
If you don't find this, it is because your documentation is missing and/or your connection is too slow to download this database. Thus, you need to be patient and let Xcode download it to your disk.
To quit Xcode and relaunch it usually helps, because it forces the IDE to look for the cache and update its UI.
When I try to build my app with Xcode, an error interrupts the build process:
Command CompileStoryboard failed with a nonzero exit code
Sometimes, it shows this error instead:
Command CompileSwift failed with a nonzero exit code
I have New Build System turned on.
What can I do to fix this?
Closing Xcode for me didn't have an effect. Instead, I cleaned the project using CommandShiftK.
I also found another reason: I had a storyboard reference to another storyboard which I had removed. The quick fix was deleting this.
I also facing same issue in xcode 10 and tried all the solutions provided but nothing working.
Then I deleted all the files and folders of the following folder :
~/Library/Developer/Xcode/DerivedData
and it worked like a charm.
When you stop building a project when the compiler is in the middle of something "important", this error could appear. In that case, building the project again and letting it finish normally makes this error disappear.
This is a known issue with Swift 4.2 and Xcode 10. I found an article here that fixed it for me: https://github.com/Yummypets/YPImagePicker/issues/236
In short, go to your projects build settings, and add a user defined setting named SWIFT_ENABLE_BATCH_MODE and set its value to NO.
Previously, I tried each of the methods suggested here (rebuild, exit Xcode, clean and rebuild, purge Derived Data files). None of them worked.
Once I added the user define build setting per the article, Swift then told me the true error. In my case, it was a missing }, but it could be any number of problems.
I encountered this error when I was upgrading my project from Swift 4 to 5.
I first updated all my pods to their latest versions. When I built, some pods showed this error.
The following steps resolved this issue for me:
Removed all pods from Podfile
Executed pod install to remove all installed pods
Executed pod deintegrate to remove support for CocoaPods
Deleted Podfile.lock and .xcworkspace from my project so no
CocoaPods anymore
Now my project is a pure Xcode project
Opened my project from the regular .xcodeproj file
Changed Swift Version of my project to Swift 5
Cleaned the project (cmd+shift+K)
Quitted Xcode
Restored all pods to my Podfile
Executed pod install to reintegrate CocoaPods and add my pods
Opened the project from the .xcworkspace file
Cleaned and rebuilt
Some old pods that were still using Swift 4.0
(SlideMenuControllerSwift in my case) were set to Swift 5.0, caused
many build errors in their code. I corrected it back to Swift 4.0
by opening the Pods project and selecting its target.
Cleaned again, rebuilt.
Now I have only errors in my own project code related with difference in Swift version I made. My job now is to fix them.
This error happened to me when I forgot to change entity Properties before creating NSManagedObject subclass. Solved by:
delete Entity+CoreDataClass.swift and Entity+CoreDataProperties.swift.
under "class" of the entity model inspector, change "module" to Current Product Module and "codegen" to Manual/None.
recreate the NSManagedObject.
I had the error Command LinkStoryboards failed with a nonzero exit code, and found that I was using a reference to a non-existent storyboard. I had recently changed the name of a storyboard file, so changing the reference from the 'old' name to the 'new' name solved it for me.
You may not have exactly the same error as me, but an easy way to find a more detailed explanation of the error is to:
Show the issue navigator (while the build time error is showing)
Click the error:
Then, you should see more about your error:
I hope this helps. Please, I am aware that I am answering from experience of a different error than this question was asked about, but I believe this advice should help you conquer similar problems!
For me cleaning the project (Command + Shift + K) and restarting xCode worked for me
If you have multiple targets, where two or more targets have files with the same name, check the target membership of those files in Files inspector. The error occurs when multiple instances of the equally named file have set the target membership for the same target.
Since this issue looks to have dozens of possible solutions and the root cause could be very vague, I'll throw my situation into the ring. Half of my pods were failing with some sort of CompileSwiftSource failure, but only on archive. I was still able to build for device and simulator just fine. I tried a lot (if not all) of the solutions suggested here with no luck. One of the pods had a slightly different error before the CompileSwiftSource error so I went to updating and trying to fix that single pod. It was the Cache library for iOS which hadn't been updated in a while. There was a fork that resolved the issue with updating to Xcode 10.2 that I was able to update to and after that, all of the other issues took care of themselves. So look for a single outlier in your pods if you're getting a bunch of them erroring out and start there.
Switching to the legacy build system fixed the issue for me
In my case, I was clean build folder then restart my mac then it's work.
I had the JSONwebtoken pod installed and that was causing issues. I needed to delete the CommonCrypto folder that is in the JSONWebtoken pod folder. Here is a ->link<- explaining the issue. This started happening in Xcode 10.
In my case it was about having a file named Location. after some digging I find out that it was about having two file with the same name (weird). Cause I don't, however, it's been solved by removing the file and adding another file with a different name.
filenames are used to distinguish private declarations with the same name
This can also occur when you have two swift files with the same name. For example, two ContentView.swift files
In my case, I used too complicated initializations inside a class extension. It suddenly broke my build.
class MyClass { }
extension MyClass {
static var var1 = "", var2 = "", var3 = "", var4 = "", ...., var20 = ""
}
Resolved:
class MyClass { }
extension MyClass {
static var var1 = "",
static var var2 = "",
static var var3 = ""
static var var4 = "", ....,
static var var20 = ""
}
In my case it was empty assets catalog, when I delete it everything was fine again.
Command CompileSwift failed with a nonzero exit code
This error happens when you are migrating your code from Xcode 9 to Xcode 10+. It due to any class name is conflicting with existing apple classes. For Example: State, Event etc.
So first change the class/structure name if any existing in your code like "State" to "StateDetail"
If Info.plist is added in target, remove tick mark from it so it will not copy app bundle (Latest Xcode10 security reason).
Select Info.plist file and uncheck under "Target Membership" in right side Identity inspector
And build code again!!!
In my case, the problem was that I assigned a .swift class to the viewController in the storyboard, while the project was Objective C.
I tried a lot of the options discussed here.
Delete and reinstall pods
Clean Build Folder
Delete Derived Data
Add SWIFT_ENABLE_BATCH_MODE and set its value to NO
Restarting Xcode and Recompiling
Restarting iMac and Recompiling
set Compilation Mode to Incremental
Changed build settings: SWIFT_COMPILATION_MODE = singlefile and SWIFT_OPTIMIZATION_LEVEL = "-O"
Nothing worked. I'm using Xcode Version 11.0 beta (11M336w).
Finally I downloaded a fresh copy and replaced the one I had previously installed. It was the same exact version. That did the trick.
I got this error while trying to run my unit tests in a submodule. What I have done is:
Change the simulator => Clean the project => Build the project => Run unit tests.
After this, my unit tests ran without any issue.
I have the issue like that and my solution is change a little thing in Build Settings:
SWIFT_COMPILATION_MODE = singlefile;
SWIFT_OPTIMIZATION_LEVEL = "-O";
it work to me
Alright, I was having the same problem with Xcode 10. I usually use a storyboard for every view, that way if someone is helping it's easier to fold code in. I needed to make one of the view on one storyboard the initial view Controller.
In my case it was renaming a file to an existing file in other folder(Group) by mistake, just rename it to what it was then the error disappeared
The targets should be specified with related data such as appicon
For me the problem was that on my Podfile I didn't put use_frameworks!. I just uncomment that line, run pod install on the terminal again. And it got fixed.
It was commented since the app was entirely made on Objective-C. Since the app now uses Swift I had to make that change on the Podfile
I had the same error Restarting Xcode and Recompiling Fixed the issue for me.
I got the same error when linking separate storyboards. The error, "Command CompileSwiftSources failed with a nonzero exit code." is shown because I simply forgot to set the view controller inside the second storyboard that I am linking as 'an initial view controller'.
In my use case I had used the function "Refactor to Storyboard" in Xcode 13. It created the new refactored story board fine but failed to add it to bundle resources.
So my fix was to:
Select the target project in Xcode Navigator
Choose the build phases tab
Expand Copy Bundled Resources to see if new storyboard was added. If not, just add it to the list and rebuild.
My app was having Notification Service Extension, and was using Xcode 11. The Extension doesn't have anything to do with pods.
After 1-2 years, I have taken that project into my new m1 chip mac with Xcode 13. But the compilation was failing and showing me the error in pods.
I tried to remove and add all pods, tried clean etc all possible available answers available on internet. Almost spent 4-5 hours to make it run, but nothing worked.
Final Solution that worked:
I removed, notification service extension from the project, its target etc too. And then tried to run the app. Amazingly it worked. After that, i added that extension again(by creating new extension and putting the same code again), and everything is working perfectly fine.
I am still surprised that, was that issue with extension or with pods. But finally it worked for me.
Hopefully, this answer might resolve someone's issue and you can save enough time.
Xcode is stuck Generating Previews after trying to migrate my project from Swift 2.3 to Swift 3.
Is there anyway to check the status of this process without cancelling?
I'm using Cocoapods and I've already changed all of the Swift pods to Swift 3 versions.
For people that are still stuck at "Generating Preview". Check if you have any class names defined that clashes with the (new) public api in Swift 3.
E.g. I had an 'Error.swift' class, which I had to rename. Since all 'NS' prefixes are being removed, this would cause the converter to keep running without providing us an error message.
There is a workaround for this problem with which you can at least complete the process and start working on migration.
Select targets to convert as usual
Wait until the converter gets stuck
Open Activity Monitor and kill the swift process
Now the converter will continue and finish the work.
Running migration from the command line worked for me. Try using this script:
https://gist.github.com/davidahouse/18dd78bef7ae543117c396f8c950ccfe
I'm trying to run tests for my app, i'm able to get to a point where it launches the app in the simulator, but then gives this error and all tests fail:
2014-05-23 12:49:30.276 App[20472:60b] Cannot find executable for CFBundle 0xd04e190 </Users/Kalyan/Library/Developer/Xcode/DerivedData/App-gkggxfqpxbiszkbmoqpwtzlklpem/Build/Products/Debug-iphonesimulator/AppTests.octest> (not loaded)
IDEBundleInjection.c: Error loading bundle '/Users/Kalyan/Library/Developer/Xcode/DerivedData/App-gkggxfqpxbiszkbmoqpwtzlklpem/Build/Products/Debug-iphonesimulator/AppTests.octest'
I'm not sure what the issue is, but I have read many forums on this. Seems like its some sort of configuration issue but i'm not able to put a finger on it.
Some people mentioned in the simulator going to Simulator > Reset Content & Settings, but that didn't help.
I have tried reading the below to no avail:
Cannot find executable for CFBundle CertUIFramework.axbundle
https://github.com/kif-framework/KIF/issues/310
https://groups.google.com/forum/#!msg/rubymotion/_tcikfIkPNo/oIp9oCrZzcwJ
Is there anything else I haven't tried?
This took me forever to figure out, but just in case somebody else is having this issue, goto the project settings, and then click on the Tests project.
Goto Build Settings. Search for Wrapper Extensions under Packaging. Make sure it's the appropriate one. Currently it should be xctest.