1. does cops work with a local (as on the Raspberry Pi) database?
2. did you end your path (in config_local.php) with a
/ ?
Code:
/*
* The directory containing calibre's metadata.db file, with sub-directories
* containing all the formats.
* BEWARE : it has to end with a /
* You can enable multiple database with this notation instead of a simple string :
* $config['calibre_directory'] = array ("My database name" => "/home/directory/calibre1/", "My other database name" => "/home/directory/calibre2/");
*/