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Build operation failed without specifying any errors. Individual build tasks may have failed for unknown reasons. One possible cause is if there are too many (possibly zombie) processes; in this case, rebooting may fix the problem.
To clean the build folder you can use the shortcut Command+Option+Shift+K or Menu Bar → Product → Hold Option Key → Clean build Folder .
cmd+7. click on the top-most "Build $APP" section. locate the warning or error. click the buttons on the right to see the full details of the step you are interested in.
Conversation. Xcode tip #5: If you have a Swift file with many errors, you can use Xcode's fix-its to try to correct them one by one. But a faster way is to go to the Editor menu and choose Fix All Issues to apply fix-its all at once. (Make sure and double-check which changes were made!)
Figured it out. On the tab with three lines in a speech bubble, it shows a build log. I guess my storyboard file had become corrupt during the last git pull.
For Xcode 12+
You can see reasons for failure on Report Navigator present in Navigator window.
Hide/Show Navigator button present in top-left side of Xcode.
Report Navigator by pressing last button present on list of buttons in Navigator window.
Here you can view reasons either By Group or By Time
Click the last icon in the top bar of the left most panel in your Xcode window to reveal the secret Archive build errors.
It will likely be something related to code signing if you are able to build and run the app, but not Archive. Further googling of your error message should resolve that now that it has been revealed.
Click the last icon in the top bar of the left most panel in your Xcode window to reveal the "secret" Archive build errors. I had permission issues which solved for me.
If you changed the Build System to the new one, change back to the Standard. It solved for me.
Faced same issue with xCode 8 the reason was that my Apple Id session expired and xCode was not able to renew it because of network connection problems once i signed in with my Apple id in preferences. I was able to build normally again
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