Right. Looks like the paths are correct (assuming that the drive is present).
I've released an update that records additional info for the issue. When you can, please download the latest update and try to run the build process. If it happens again, please send the logs and the recipe file to the support email (you can find it in https://itch.io/support and click on "Email the developers", right under the section "Are you looking for support for RPG Maker Cook Tool Deluxe?").
I'm also available on Discord if you use that (same avatar and name).