Hi Thomas,
As i can see, The permissions are still incorrect in components/com_sellacious/. Please see this image:
The correct permissions of files should be 644 and 755 for folders. I would request you to kindly fix the permissions. I am sure that this will fix the error.
PS: You might need to do the same for administrator/components/com_sellacious folder.
Please let us know if it solves the issue. We'll be happy to assist you further.
Thanks,
Ankit A.
Team Sellacious