Xcode 6 Beta / Swift - Playground not updating

Question

I was playing around with the Playground feature of Xcode 6\'s first beta - and I notice half the time the Playground doesn\'t update (simply doesn\'t display the result calcula

Answer 1

Had the same strange errors after upgrading to xcode 6 beta 6. For me the problem got fixed with a Product -> Clean. And if that does not fix the errors hold down option key and click again on Product in the Menubar then you will see in the dropdown menu Clean Build Folder... click on that. Or you could download Watchdog app from appstore. This little helper automatically cleans your xcode projects.