'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 tried going to Compile Sources in the Build Phases tab and deleting and re-adding the selected file (and cleaning and rebuilding)but it didn't work :( Instead, this following answer worked for me if you get the 'Build input file cannot be found' error message:

1. Delete the affected files in Xcode (I right-clicked->Delete'd in the Navigator)
2. Re-add the affected file (mine was .mlmodel) and I selected "Copy items if needed" under Destination.
3. Cmd-shift-k to clean and then Cmd-b to build and voila! The file was recognized and error gone!

Hope this helps!