Blueprint-error

Hi,
I have this blueprint:

title: Blog Post

num: '{{ page.date.toDate("Ymd") }}'

status:
  draft: true
  listed: true

tabs:
  content:
    label: Content
    icon: tablo-content
    columns:
      - width: 2/3
        sections:
          content:
            type: fields
            fields:
              text:
                label: Text
                type: textarea
                size: large
			
      - width: 1/3
        sections:
          sidebar:
            type: fields
            fields:
              date:
                label: Published
                type: date
                default: now
                required: true

              tags:
                label: Tags
                type: tags
                options:
                  type: query
                  query: page.siblings.pluck("tags", ",", true)

              author:
                label: Author
                type: users
                multiple: false

              pinned:
                label: Pinned
                type: toggle
                text:
                  - not pinned
                  - post is pinned to the top

          files: sections/files

  seo: tabs/seo
  files: tabs/files

In order to save additional intro text, I would like to insert another text field:

title: Blog Post

num: '{{ page.date.toDate("Ymd") }}'

status:
  draft: true
  listed: true

tabs:
  content:
    label: Content
    icon: tablo-content
    columns:
      - width: 2/3
        sections:
          content:
            type: fields
            fields:
              text:
                label: Text
                type: textarea
                size: large
			  
			  intro:
                label: Intro
                type: textarea
                size: large

      - width: 1/3
        sections:
          sidebar:
            type: fields
            fields:
              date:
                label: Published
                type: date
                default: now
                required: true

              tags:
                label: Tags
                type: tags
                options:
                  type: query
                  query: page.siblings.pluck("tags", ",", true)

              author:
                label: Author
                type: users
                multiple: false

              pinned:
                label: Pinned
                type: toggle
                text:
                  - not pinned
                  - post is pinned to the top

          files: sections/files

  seo: tabs/seo
  files: tabs/files

Instead of another text box, however, the sidebar disappears and this message appears:


What could have gone wrong with these four added lines?

Thanks

Oh dear, I had tabs instead of spaces in the code. Strange.