'Build input file cannot be found' Swift 4.2, Xcode 10.0

Question

I am getting the following error when building in Xcode 10.0 with swift 4.2:

Answer 1

I got this error when i renamed a ViewController name using "Refactor". The view controller name occurrences were changed but an old reference was somewhere still existing.

Deleting derived data & Clean build folder worked for me.

Here's how to delete Derived data:

File>Workspace settings> Click arrow & remove all folders inside Derived Data.