Problem exporting a copy of a document as odt

No rush with this - I realise I’ve been raising a few issues (as a new user) and don’t want to take up time. However, I have noticed that when I copy a document - in this case, from Standard Template to a new one that is identical but specifies the citation style as Chicago 17 (note) and the language as English UK - and then try to export it as an ODT file, I get the below error:

I should say exporting as a DocX works absolutely fine. ODT export also works fine when I use the Standard Article template.

BTW I do love Fidus Writer. It really is fantastic and I appreciate the work and vision behind it.

This has been fixed in the last 3.9 release. Also 3.10 has been fixed.

Thank you. Much appreciated.