@PepaBrno
Thank you.
I have identified your problem.
Now please delete info.php from your server!
The version of sqlite3 that your hosting provider uses is to old to use with calibre 5.
Therefore if you remove the 2 tables from the database it works again (Calibre version 4 database format).
To have it work automatically use this fork of COPS:
https://github.com/jvanderzande/cops/commits/master
This might work, but your best bet is to do what you are already doing, stripping tables from the calibre database.
[
I have been able to make it work on my hosting provider (where it already works), however even there the sqlite3 version is "wrong", and it took some fiddling with databases and code. It's just not worth it for me.]
PS:
as an added safety feature I would advise you to use password protection. Either through:
- your hosting provider, or
- editing .htaccess in the cops directory, or
- using the config_local.php of COPS