Lightroom 13 doesnt recognise my files for export

I am using the latest version 13.0.1 of Lightroom on a mac running ventura.

Ive been trying to export my edited photos...something Ive done 100s of times before and as soon as I press the export button with all files highlighted I get a message saying " Originals missing for some images ..smart previews will be used if available...do you want to continue"

I enter yes and press enter and a message comes up saying  the export operation could not be performed because none of the 414 files I want to export to a desktop folder can be found.

Ive synced the photos and they show up as previous imports in the catalogue and the sd card I used to import the photos is still inserted into my mac and showing up as visible.

Any help/ideas would be greatly appreciated