Logging at level: debug Configuration file: /github/workspace/./_config.yml 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... EntryFilter: excluded /README.md Generating: JekyllOptionalFrontMatter::Generator finished in 4.6918e-05 seconds. Generating: JekyllReadmeIndex::Generator finished in 4.8621e-05 seconds. Generating: Jekyll::Paginate::Pagination finished in 3.286e-06 seconds. Generating: JekyllRelativeLinks::Generator finished in 2.8143e-05 seconds. Generating: JekyllDefaultLayout::Generator finished in 0.001204954 seconds. Generating: JekyllTitlesFromHeadings::Generator finished in 1.8315e-05 seconds. Rendering: 404.md Pre-Render Hooks: 404.md Rendering Liquid: 404.md Rendering Markup: 404.md Requiring: kramdown-parser-gfm Rendering Layout: 404.md Layout source: site github-pages 231 | Error: Liquid error (line 7): concat filter requires an array argument