Chronos-Swift Dependency Analysis Error

[TheDarkRoom]

Followed instructions to use TuningFork in project by adding line in cocoapods and installing but doesn't compile in XCode 8.3. Error saying to check dependencies:
“Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift. Use the [Edit > Convert > To Current Swift Syntax…] menu to choose a Swift version or use the Build Settings editor to configure the build setting directly.
If I follow this conversion to current swift syntax, then I get 119 errors in Chronos-Swift and Tuning Fork which are locked files.
Please help. I've heard TuningFork is great, but obviously no good with these errors!