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I am running XCode v.5.1 in my Mountain Lion, I don't know why, but I'm getting this message after a successful start of Mac computer. I was already using this version of XCode before and now suddenly it's showing me this message? What's wrong? It is something that Apple forgets its my first run?

  • Did you update xCode? – Rob May 21 '14 at 6:38
  • Yes, I'd updated it from XCode v.5.0 to v.5.1. And v.5.1 was already running (I can say, some couple of weeks)! Then sudden this message appearing. – Hemang May 21 '14 at 6:40
  • Does it appear every time you close Xcode and subsequently reopen it? Or did it just occur this one time? – njboot May 21 '14 at 6:55
  • You could consider removing XCode and perform a new install using the AppStore. Please post the results afterwards. During the update something might have caused this issue. Please try this first. – Rob May 21 '14 at 7:10

If you're not able to set the quarantine status on the app, then it will forever have that status and will prompt you. You can manually remove quarantine from the app with…

xattr -d com.apple.quarantine /Applications/Xcode.app

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