Stable diffusion not usable

i installed stable diffusion plugin, but cannot use it in the smart picker.
Nextcloud Hub 7 (28.0.3)
Stable Diffusion plugin 1.0.2
installation of the stable diffussion plugin should be corret

Giphy plugin shows up in notes/smart picker, so installation of plugins that show up there should be correct.
What am I doing wrong?

has anyone an idea?