No logging is visible for me.
Yes, it's only visible to me.
I use the jAlbum uploader already 10 years to upload albums to my Stratoserver, but I can't remember that I ever had seen this error message, so I guess there is recently someting changed which causes this problem.
You are adding the album
http://www.andrewolff.nl/FotoSerie/Klompenpaden/ but the server redirects to
https://www.andrewolff.nl/FotoSerie/Klompenpaden/ . This is probably new behavior by your server.
The add album function doesn't follow redirects, so that's why it fails. We could add that but currently haven't. So currently you need to tell jAlbum that the URL starts with https.