I keep getting error "Setting 'button_label' must be a CSS color"

Hi, so I keep getting this error message when I try to edit the typography in the setting section. It lets me change the type face but it doesn’t show in previewer, the font stays the sameHow can I fix this?

I’m using the Sense theme

Have you updated any theme files?

I updated the max font size for the header but that was it. I ended up logging off and when it restarted it had adjusted - so all fixed! -Thanks so much!