Custom Block error in Panel

Hi everyone,
I created a custom block (“slider”) for my layout field but always get this error inside the panel:

Cannot assign array to property Kirby\Cms\Fieldset::$icon of type ?string in file: […]/kirby/src/Cms/Fieldset.php line: 52

  • I have put my custom block slider.yml inside blueprints/blocks
name: Slider
  fields:
    sliderimages:
      type: files
  • I have put the snippet slider.php inside snippets/blocks
  • The Layout field in the blueprint is set up like this:
              layout:
                type: layout
                layouts:
                  - "1/1"
                  - "1/2, 1/2"
                  - "2/6, 1/6, 3/6"
                  - "1/3, 1/3, 1/3"
                  - "2/3, 1/3"
                  - "2/6, 3/6, 1/6"
                  - "1/6, 3/6, 2/6"
                fieldsets:
                  - text
                  - image
                  - slider

What am I missing?

Fields must not be indented here

Oh, right! those indentations get me everytime :sweat_smile: Thanks!