Sun Card: Cant get it running

[RetroButton (Peter)]

I try to get the following Lovelace card to work. But i have absolutely no luck so far.
AitorDB/home-assistant-sun-card: Home assistant sun card based on Google weather design (github.com)
I have installed the card using HACS. Card is installed, as far as i can see. It is available in the ressources, but every time i try to use it i get the error on the screenshot.

What is the problem?

[tom_l]

Do you have the sun integration installed?

Sun

[RetroButton (Peter)]

Sun integration is running.

[tom_l]

Have you installed the correct sun card. There are two.

[RetroButton (Peter)]

I have this card installed:
AitorDB/home-assistant-sun-card: Home assistant sun card based on Google weather design (github.com)

[Burningstone]

Did you reload the browser cache?

[RetroButton (Peter)]

No, did not help.
I tried the manual install method too, same result.