Failed to communicate with interface error on ubuntu server

[username0504]

I installed Calibre and did the following steps. https://calibre-ebook.com/download_linux

1.

sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin

(so root is the owner of /opt/calibre/)

2. I created my directory for my books and unsorted books. I ran

calibredb add /media/toadd/* --library-path /media/library

which imported all my books. I also changed the permissions of these directories to the user which will run the service.

3. As shown here, I created the service file for my system, with the user from before.

My only difference is:

ExecStart=/opt/calibre/calibre-server --port=8081 "/media/library"

4. Everything was working, except I wanted admin ability to edit the library. I saw I had to create users, so I ran this

calibre-server --userdb ~/calibre/users.sqlite --manage-users

5. I updated my calibre-server.service file to this:

ExecStart=/opt/calibre/calibre-server --port=8081 --userdb ~/calibre/users.sqlite --enable-auth "/media/library"

Everything was working, got prompted for a user/pass. which I submitted.

Now, after logging in, I get the following error:

Failed to communicate with "/interface-data/init?1535559912493", with status: [500] Internal Server Error

I even tried changing my ownership of /opt/calibre to the same user running the service. No luck. Same error
Not sure what's going on....

[username0504]

Some success. it doesn't like

~/calibre/users.sqlite

Must be hard coded

[kovidgoyal]

https://github.com/kovidgoyal/calibr...039c4e27c80236