AE CC Error (86::1)

I'm trying to relink an AE CC 2017 project with photos and footage that had been moved.

I do the replace command and navigate to the missing file. When I click ok I get (86::1) which is After Effects error: Unsupported video bit depth in source file. 

This project worked fine last November. No issues what so ever, now when I try and relink, it's not working

Anyone have an answer?

much appreciated

jack