Exception Coding Error - don't understand '[not in use]' from /etc/asterisk/musiconhold_additional.conf

Asterisk Version: 13.14.0

I’m getting the following
Exception Coding Error - don’t understand ‘[not in use]’ from /etc/asterisk/musiconhold_additional.conf after updating modules on my PBXact system

The /etc/asterisk/musiconhold_additional.conf file contains

[not in use]
directory=/var/lib/asterisk/moh/not in use

and the directory “/var/lib/asterisk/moh/not in use” is there and has files in it.

Do I need the [not in use] section?

Any ideas what is the root cause of this?
Many thanks,

Directories can’t have spaces. You need to remove that directory from the music on hold module