title: Linker Command failed with exit code 1 (use -v to see invocation), Xcode 8, Swift 3
body: <p>I can't get rid of this error!</p>
  
  <p><a href="https://i.stack.imgur.com/JwtrU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/JwtrU.png" alt=""></a></p>
  
  <p>I have tried all sorts of things like clearing Derived Data(Preferences->Locations->click gray arrow to open Derived Data folder in Finder->right-click, move to trash), cleaning the project(CMD+Shift+K or Product->Clean), updating carthage and dependencies, checked other answers on StackOverflow (mostly adjustments in Build Settings/Phases), and recloned the app from github, etc.</p>
  
  <p>The same project works on my collaborators computers..</p>
  
  <p>EDIT:
  From the current top-rated answer, I was able to debug a little further...I am still not sure how to fix though. It looks like I have something in the project twice? I looked and can't find anything showing up twice!</p>
  
  <p>Here's a picture of the log:
  <a href="https://i.stack.imgur.com/gngDH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/gngDH.png" alt=""></a></p>