cant get flex horse shoe to work

i have installed via HACS
then I went to resources manager and added


> - type: 'custom:flex-horseshoe-card'
entities:
- entity: weather.dark_sky
attribute: temperature
decimals: 1
unit: '°C'
area: De Maan
show:
horseshoe_style: 'lineargradient'
layout:
states:
# Refers to the first entity in the list, ie index 0
# State value is positioned at (50%,60%) with a large font size
# The size of the units are automatically calculated at 60% of the
# state value font size and shifted upwards.
# The default font color is the theme defined primary-text-color.
- id: 0
entity_index: 0
xpos: 50
ypos: 60
styles:
- font-size: 3.5em;
areas:
# Refers to the first entity in the list, ie index 1
# Area value is positioned at (50%,35%) with font-size 1.5 and
# an opacity of 80%.
# The default font color is the theme defined primary-text-color.
- id: 0
entity_index: 0
xpos: 50
ypos: 35
styles:
- font-size: 1.5em;
- opacity: 0.8;
horseshoe_scale:
min: -10
max: 40
color_stops:
10: 'red'
18: 'blue'

resulting in no card type configured when just trying this code

obviously changed the entity to enter one existing in my HAOS