Error but still works?

[guitarguy1685]

I'm trying to incorporate icons and emojis into my site. I followed the instructions here . The weird thing is that in vscode I'm shown a squiggly underline on this snippet and my document is highlighted red. I assume this tells me there is something wrong in the yml file. However the site still works, even when I build it for offline access. Is there something obvious wong here that I'm not noticing? Like it said, it still works, but those warnings are making ane anxious.

yml text blow

site_name: Novum Structures - Technical Services
site_description: Tech Services Handbook
site_url: ""
site_dir: docs-offline
use_directory_urls: false

theme:
  name: material
  palette:
    # Palette toggle for dark mode
    - media: "(prefers-color-scheme: dark)"
      scheme: slate
      primary: deep orange
      accent: deep orange
      toggle:
        icon: material/brightness-4
        name: Switch to light mode

    # Palette toggle for light mode
    - media: "(prefers-color-scheme: light)"
      scheme: default 
      primary: black
      accent: deep orange
      toggle:
        icon: material/brightness-7
        name: Switch to dark mode

  features:
    - content.tabs.link
    - content.tooltips
    #- navigation.instant
    #- navigation.instant.prefetch
    #- navigation.instant.progress
    #- navigation.tracking
    - navigation.tabs
    - navigation.tabs.sticky
    #- navigation.sections
    - navigation.expand
    - navigation.path
    - navigation.prune
    - navigation.indexes
    - navigation.tracking
    - navigation.top
    - search.share
    - search.suggest
    - toc.follow
    - toc.integrate

plugins:
  - search
  - offline

markdown_extensions:
  - admonition
  #- pymdownx.details
  #- pymdownx.superfences
  - attr_list
  #- md_in_html
  - tables
  - attr_list
  - md_in_html
  - pymdownx.blocks.caption
  - admonition
  - toc:
      permalink: true
      title: On this page
  - pymdownx.snippets
  - pymdownx.emoji:
      emoji_index: !!python/name:material.extensions.emoji.twemoji
      emoji_generator: !!python/name:material.extensions.emoji.to_svg
      
extra_css:
  - stylesheets/extra.css

nav:
  - Home:
    - index.md
    - Terms: terms.md
    - Standard Parts: nsp.md

  - CAD:
    - cad/index.md
    - cad/cui.md
    - AutoLISPs:
      - cad/lisp/index.md
    - Tool Palettes:
      - cad/toolpalette/index.md
    - Pen Settings: cad/pens.md

  - Advance Steel: 
    - advs/index.md
    - advs/setup.md
    - DXF Files: advs/dxf.md

  - Fabrication:
    - fab/index.md
    - Bill of Materials: fab/bom.md
    - BoM Tab: fab/tabbom.md

[kamilkrzyskow]

Hello @guitarguy1685,
are you using the recommended schema for checking the file?

• https://squidfunk.github.io/mkdocs-material/creating-your-site/#minimal-configuration

The !! is an MkDocs extension to the YML syntax, so depending on the tools you're using it might see it as incorrect.