Cannot Change My Plex Agent Back to Plex Movie

Server Version#:1.43.1.10611
Player Version#:1.112.0.359-0d79a49f
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

I switched my Plex agent from Plex Movie to Plex Personal Media:

Movies Category (click 3 dots) - Manged Library - Edit - Advanced / Agent

Now I cannot switch it back.

If I change the agent back to Plex Movie, it gave the error:

Scanner (in Red) A scanner is required

The “Saved Changes” option is greyed out too!

A Refresh All Metadata messed up all my poster … etc.

Can anyone help?

Newbie here! My simple Plex Server is on windows 11 Pro.

Regards

Pear