Pb with images in an upgraded project

Hi,

I'm trying to update an old project. Opening the AN file from the <project>_upgraded folder, I get this exception message :

Saving and relaunching Edge Animate produces the same message.

In the Library, the Images section doesn't reflect the content of my images folder : many files are missing.

How do I restore a sane state to be able to update the project ? Any idea ?

Thanks.

Gil