Swift SourceKitService Crashed

Question

I have a Swift project using Core Data and the generated code for saveContext() is causing Xcode to crash with the SourceKitService Crashed error. When I comment it

Answer 1

Apple solve this crash Version: 6.1.1

What's New in Version 6.1.1

Includes SDKs for OS X 10.10 Yosemite, OS X 10.9 Mavericks, and iOS 8.1

• Fixes common causes of SourceKit crashes when working with Swift
• Additional bug fixes and stability improvements

https://itunes.apple.com/us/app/xcode/id497799835?ls=1&mt=12

also you can solve this using delete your project from following path

~/Library/Developer/Xcode/DerivedData