Octolapse unknown error when trying to enable Custom Image Preferences

I hit the test button and it shows as fine, but as soon as I scroll down and try and click the box for Custom Image Preferences, I get an Unknown error?

I can view my camera stream with no problem, just not use Custom Image Preferences. Any idea?

Hi did you solve this issue? I've got the same :-/

No, sorry.

Moved away from Octoprint for Fluidd and Klipper.