Plex not working on Seagate D2 NAS business drive



Just installed Plex, I can access it from local network, can login but struggle with two setting problems:
1) When trying to access Settings -> Server, i get this:
2) When trying to add a folder within NAS with photos, i get this when pressing "Add library": (obviously I have added appropriate folder from NAS with photos in it)

Attached is debug log, if that helps.