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I have updated to 10.14. Then I could not launch Xcode 7.3.1 (believe me I wish this were not necessary). I downloaded and re-installed Xcode 7.3.1, but I still get the same error in the "Report to Apple" dialog:

Dyld Error Message:
  Symbol not found: _OBJC_IVAR_$_NSTextViewIvars.sharedData
  Referenced from: /Applications/Xcode.7.3.1.app/Contents/MacOS/../SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
  Expected in: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
  in /Applications/Xcode.7.3.1.app/Contents/MacOS/../SharedFrameworks/DVTKit.framework/Versions/A/DVTKit

I have tried

sudo xcode-select --switch /Applications/Xcode.7.3.1.app/Contents/Developer

which doesn't seem to solve the problem either.

Note: after each failed attempt to launch, I have to remove the quarantine xattrs with:

sudo xattr -dr com.apple.quarantine /Applications/Xcode.7.3.1.app
Michael
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  • Could you explain why you need Xcode 7 instead of a later version? – Caleb Oct 23 '18 at 15:50
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    @Caleb there could be many reasons: (1) compatibility testing of a framework that you distribute ; (2) support for older Swift versions. Note that Apple Store Connect still accepts app uploads built with Xcode 6. – Cœur Oct 24 '18 at 04:28
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    Possible duplicate of [Not able to open Xcode 8.3.2 on macOS 10.14 beta](https://stackoverflow.com/questions/50725674/not-able-to-open-xcode-8-3-2-on-macos-10-14-beta) – Cœur Oct 24 '18 at 04:29
  • Did you find any solution for this? – Besat Nov 14 '18 at 17:08
  • still no solution. I had to grab another computer that's not on mojave /-: – Michael Nov 14 '18 at 19:01

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