Strange Xcode Error

The project in question did at one time have the indicated file. This file was removed from the project, then deleted from the computer entirely. Yet this Xcode message persists.

The project still compiles and runs. but the fact this error exists is annoying.

a dependency noted some where that causes this ?
maybe not in the swift file itself but in the project file ?

the strange thing is when clicking on the above error, it shows the file in the editor, even when the file does not exist anywhere

:man_shrugging:

no idea
linked from another project or something ?