Installing theme in kde DE

I am unable to install new theme in kde

Could not install dependency: 'kns://sddmtheme.knsrc/api.kde-look.org/2056189'

Could not install dependency: 'kns://sddmtheme.knsrc/api.kde-look.org/2056189'

This is the error after putting the password.

Installing theme in kde DE - blendOS