myApp[12345:678] Could not load the "image.png" image referenced from a nib in the bundle with identifier "com.company.app"
Select the filename in red, press alt-command-0 (zero) to open Utilities view (at right), go to Identity and Type view (first i.e. top) and check Location. There is a miniscule browse button, which you can use to tell project where the missing file is currently.
For group of lost files you can choose a folder, for a single file you still can choose folder - but the file won't be found. Choose the exact file.