Comment 7 for bug 1743064

The cause is probably that then blender program is not correctly specified in the preferences. (But I can't reproduce it.) To fix this go to Files>Preferences, on tab Programs select "Reset to default" and close dialog with "Ok". Now it should work again. (I will add an additional check for this case.)

(If you still get the error, check that you can run exiftool from a terminal.)