so I used Venmo/Synx on my Xcode project with CocoaPods, and it completely screwed everything up.
I was able to fix the Manifest.lock and Podfile.lock errors, but now I
I faced this issue when I upgraded/downgraded cocoapods between 1.6.x and 1.5.x. The following step fixed this error
1, go to project info tab
2, just under Deployment target, there is configurations field. change your configuration. In my case, there are 2 options
/Users/user/GitHub/xxxxxx/Pods/Pods/Target Support Files/Pods/Pods.debug.xcconfig
/Users/user/GitHub/xxxxxx/Pods/Target Support Files/Pods/Pods.debug.xcconfig
3, clean and build again.