Just finished resolving my errors after converting to Swift 3 only to get this error when trying to compile. I have attached a screenshot for clarity, it does not look like
Swift4/5 Xcode10 Same Issue...
After upgrade cocoapods, reset pods, clean the build folder...., all these tries, it still fails... until I found this post.
However, there's no space in my project name, but do have a special characrter <'> in it. I decided to give it a try to see if it is the source of issues. After following along the instructions in how-do-i-completely-rename-an-xcode-projec, the project builds successfully, finally.
So just a note: avoid using space or other special characters in the project name, that may cause some unexpected errors