I\'ve been reading all the issues about the error:
dyld: Library not loaded: @rpath/Bolts.framework/Bolts
Referenced from: /private/var/mobile/Containers/Bun
Had same issue adding pods to WatchKit Extension. Linking main target with Watch app is not the best option at all. Found out that cocoapod 0.37.2 hasn't added 'Embed Pods Frameworks' script into build phase.
Script:
"${SRCROOT}/Pods/Target Support Files/Pods-ExtensionName/Pods-ExtensionName-frameworks.sh"