Xcode Version 6.1 (6A1030) - Apple Mach O-Linker Error - Building

Question

I upgraded my Xcode to the latest version: Version 6.1 (6A1030).
I use Swift language.
When I build my app, I have 25 issues:

Apple Mach-O Linker err         


        

Answer 1

As usual when upgrading Xcode:

• Clean your build folder (Product -> (Alt key) -> Clean Build Folder)
• Clean project (Product -> Clean)
• Delete derived data
  • Xcode < 6.3: Window -> Organizer -> Delete derived data
  • Xcode >= 6.3: Window -> Projects (select project) -> Delete derived data

Then try to build your project again.