'Filename04 resolves to none and can not be saved'

when i try to push changes the error ‘filename 04 resolves to none can not be changed’ keeps coming up. anyone know how to fix this?

Did you add a file recently ?

If so try to rename them with good formatting, otherwise, reopen your project, you can also try to select all your assets in the Content Browser > Right click > Resave selected assets.