Step 1: Download book, etc. from RW.com
Step 2: Go to Chapter 4 starter directory
Step 3: pod install
Step 4: open workspace
Step 5: Ctrl + B
Step 6: Look at all the errors saying it can’t find RxSwift
Step 7: Look at RxSwift sitting right there in the Pods directory
Step 8: Come here wondering what’s up
After much fiddling, turning off and on again, deleting derived data, downloading the project files again, etc., I finally got it working by shortening the name of the directory from the one that got unpacked from the zip. None of the errors I encountered suggested that was the issue, but that seems to have resolved it for me.
I was having a similar issue, with Xcode not being able to find the debug configuration file for Pods-Combinestagram. I was able to solve it by deleting the Pods directory from the Xcode project (not workspace) and then reinstalling the pods. Another problem I ran into was that RxCocoa is being imported but is not in the Podfile so I had to add it to the Podfile.