Won't accept my directory

[borgauf]

I have a system-wide apt install of phpliteadmin 1.9.8.2 on Ubuntu 22.10. In my /etc/phpliteadmin.config.php file I've tried to give a directory

$directory = '/home/homedir/Dropbox/org/databases';

but this produces

The directory you specified to scan for databases does not exist or is not a directory.

I assume this is some permissions problem? The directory does exist and has two sqlite databases in it.