Problems after upgrading to Xcode 10: Build input file cannot be found

Question

I upgraded my Xcode SDK to version 10 last night and then find I cannot build.

I\'m getting this error:

Build input file cannot be found: \

Answer 1

I ran into this error after renaming a file. Somehow Xcode didn't correctly rename the actual file on disk.

So it wasn't able to find the file. Sometimes the files gets highlights with a red text color. At other times the Swift icon in front of the file was getting a gray overlay.

The fix was simple.

• Look into the error and see exactly which file it's unable to find.
• Select the file that can't be found.
• Go to the 'File Inspector'. It's on Xcode's right navigation pane.
• Click on the folder icon.
• Select the correct file.
• Clean build and run it again.