Logging at level: debug GitHub Pages: github-pages v231 GitHub Pages: jekyll v3.9.5 Theme: jekyll-theme-primer Theme source: /usr/local/bundle/gems/jekyll-theme-primer-0.6.0 Requiring: jekyll-github-metadata Requiring: jekyll-seo-tag Requiring: jekyll-coffeescript Requiring: jekyll-commonmark-ghpages Requiring: jekyll-gist Requiring: jekyll-github-metadata Requiring: jekyll-paginate Requiring: jekyll-relative-links Requiring: jekyll-optional-front-matter Requiring: jekyll-readme-index Requiring: jekyll-default-layout Requiring: jekyll-titles-from-headings GitHub Metadata: Initializing... Source: /github/workspace/. Destination: /github/workspace/./_site Incremental build: disabled. Enable with --incremental Generating... Generating: JekyllOptionalFrontMatter::Generator finished in 0.00048661 seconds. Generating: JekyllReadmeIndex::Generator finished in 3.7229e-05 seconds. Generating: Jekyll::Paginate::Pagination finished in 2.916e-06 seconds. GitHub Metadata: Generating for stanch/reftree GitHub Metadata: Calling @client.pages("stanch/reftree", {}) Generating: JekyllRelativeLinks::Generator finished in 0.139633319 seconds. Generating: JekyllDefaultLayout::Generator finished in 0.000220472 seconds. Requiring: kramdown-parser-gfm Generating: JekyllTitlesFromHeadings::Generator finished in 0.009333643 seconds. Rendering: assets/css/style.scss Pre-Render Hooks: assets/css/style.scss Rendering Markup: assets/css/style.scss Rendering: Guide.md Pre-Render Hooks: Guide.md Rendering Markup: Guide.md Rendering Layout: Guide.md Layout source: theme GitHub Metadata: Calling @client.repository("stanch/reftree", {:accept=>"application/vnd.github.drax-preview+json"}) Rendering: JsDemo.md Pre-Render Hooks: JsDemo.md Rendering Markup: JsDemo.md Rendering Layout: JsDemo.md Layout source: theme Rendering: Navigation.md Pre-Render Hooks: Navigation.md Rendering Markup: Navigation.md Rendering Layout: Navigation.md Layout source: theme Rendering: Overview.md Pre-Render Hooks: Overview.md Rendering Markup: Overview.md Rendering Layout: Overview.md Layout source: theme Rendering: Talks.md Pre-Render Hooks: Talks.md Rendering Markup: Talks.md Rendering Layout: Talks.md Layout source: theme Rendering: talks/Immutability.md Pre-Render Hooks: talks/Immutability.md Rendering Liquid: talks/Immutability.md github-pages 231 | Error: Liquid syntax error (line 10): Unknown tag 'youtube'