White screen ( of death ;) )

title: "Home"
path: "home"
type: custom:layout-card
layout_type: custom:horizontal
layout:
  cards:
    ##########
    # Linker sectie: Knoppen
    ##########
    - type: vertical-stack
      view_layout:
        position: left
        width: 33%  
      cards:
        - type: custom:mushroom-template-card
          primary: Muziek
          icon: mdi:alpha-m-circle-outline
          tap_action:
            action: call-service
            service: input_select.select_option
            service_data:
              entity_id: input_select.dashboard_view  
              option: muziek
          icon_color: white
          fill_container: true
        - type: custom:mushroom-template-card
          primary: Verlichting
          icon: mdi:alpha-v-circle-outline
          tap_action:
            action: call-service
            service: input_select.select_option
            service_data:
              entity_id: input_select.dashboard_view  
              option: verlichting
          icon_color: white
          fill_container: true
        - type: custom:mushroom-template-card
          primary: Camera
          icon: mdi:alpha-c-circle-outline
          tap_action:
            action: call-service
            service: input_select.select_option
            service_data:
              entity_id: input_select.dashboard_view  
              option: camera
          icon_color: white
          fill_container: true
        - type: custom:mushroom-template-card
          primary: Energie
          icon: mdi:alpha-e-circle-outline
          tap_action:
            action: call-service
            service: input_select.select_option
            service_data:
              entity_id: input_select.dashboard_view  
              option: energie
          icon_color: white
          fill_container: true


    - type: custom:config-template-card
      entities:
        - input_select.dashboard_view  
      card:
        type: custom:stack-in-card
        cards:
          - type: "custom:mushroom-template-card"
            primary: >
              ${ states['input_select.dashboard_view'].state === 'muziek' ? 'muziek' : 
                states['input_select.dashboard_view'].state === 'verlichting' ? 'verlichting' : 
                states['input_select.dashboard_view'].state === 'camera' ? 'camera' : 
                states['input_select.dashboard_view'].state === 'energie' ? 'energie' : '' }
            icon: mdi:alpha-m-circle-outline
            tap_action:
              action: navigate
              navigation_path: >
                ${ states['input_select.dashboard_view'].state === 'muziek' ? '/ui_lovelace_minimalist/dashboard/adaptive-dash/views/muziek' :
                  states['input_select.dashboard_view'].state === 'verlichting' ? '/ui_lovelace_minimalist/dashboard/adaptive-dash/views/verlichting' :
                  states['input_select.dashboard_view'].state === 'camera' ? '/ui_lovelace_minimalist/dashboard/adaptive-dash/views/camera' :
                  states['input_select.dashboard_view'].state === 'energie' ? '/ui_lovelace_minimalist/dashboard/adaptive-dash/views/energie' : '' }
            icon_color: white
            fill_container: true

my 4 yaml files are in config/ui_lovelace_minimalist/dashboard/adaptive-dash/views/
but I can’t see a thing.

Where do I go wrong ?