Because there was a bug:
https://github.com/kovidgoyal/build-...bb3229e0fff372
In the next calibre release, this will show the error message you expected to see.
Quote:
Another calibre program such as calibre-server or the main calibre program is running. Having multiple programs that can make changes to a calibre library running at the same time is a bad idea. calibredb can connect directly to a running calibre content server, to make changes through it, instead. See the documentation of the --with-library option for details.
|