Error building on Cloudflare pages

[improvethings]

16:28:30.060	go version go1.14.4 linux/amd64
16:28:30.063	go version go1.14.4 linux/amd64
16:28:30.073	Installing missing commands
16:28:30.073	Verify run directory
16:28:30.074	Executing user command: jekyll build
16:28:30.802	Configuration file: /opt/buildhome/repo/_config.yml
16:28:30.819	Source: /opt/buildhome/repo
16:28:30.819	Destination: /opt/buildhome/repo/_site
16:28:30.819	Incremental build: disabled. Enable with --incremental
16:28:30.819	Generating...
16:28:30.835	Jekyll Feed: Generating feed for posts
16:28:30.908	�[31m Conversion error: Jekyll::Converters::Scss encountered an error while converting 'assets/css/theme.scss':�[0m
16:28:30.908	�[31m Error: File to import not found or unreadable: vendor/rfs. on line 6:1 of _sass/bootstrap/_mixins.scss from line 10:1 of theme.scss >> @import "vendor/rfs"; ^ �[0m
16:28:30.909	�[31m ------------------------------------------------�[0m
16:28:30.909	�[31m Jekyll 4.2.0 Please append --trace to the build command �[0m
16:28:30.909	�[31m for any additional information or backtrace. �[0m
16:28:30.909	�[31m ------------------------------------------------�[0m
16:28:30.910	/opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-sass-converter-2.1.0/lib/jekyll/converters/scss.rb:190:in `rescue in convert': Error: File to import not found or unreadable: vendor/rfs. (Jekyll::Converters::Scss::SyntaxError)
16:28:30.910	on line 6:1 of _sass/bootstrap/_mixins.scss
16:28:30.910	from line 10:1 of theme.scss
16:28:30.910	>> @import "vendor/rfs";
16:28:30.910
16:28:30.910	^
16:28:30.910	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-sass-converter-2.1.0/lib/jekyll/converters/scss.rb:182:in `convert'
16:28:30.910	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:106:in `block in convert'
16:28:30.910	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `each'
16:28:30.910	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `reduce'
16:28:30.910	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `convert'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:84:in `render_document'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:63:in `run'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:547:in `render_regenerated'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:539:in `block in render_pages'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:538:in `each'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:538:in `render_pages'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:211:in `render'
16:28:30.911	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:80:in `process'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:28:in `process_site'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:65:in `build'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:36:in `process'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `each'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program'
16:28:30.912	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
16:28:30.913	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
16:28:30.913	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
16:28:30.913	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
16:28:30.913	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
16:28:30.913	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/exe/jekyll:15:in `<top (required)>'
16:28:30.913	from /opt/buildhome/cache/binstubs/jekyll:29:in `load'
16:28:30.913	from /opt/buildhome/cache/binstubs/jekyll:29:in `<main>'
16:28:30.913	/opt/buildhome/repo/_sass/bootstrap/_mixins.scss:6: Error: File to import not found or unreadable: vendor/rfs. (SassC::SyntaxError)
16:28:30.913	on line 6:1 of _sass/bootstrap/_mixins.scss
16:28:30.914	from line 10:1 of theme.scss
16:28:30.914	>> @import "vendor/rfs";
16:28:30.914
16:28:30.914	^
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/sassc-2.4.0/lib/sassc/engine.rb:50:in `render'
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-sass-converter-2.1.0/lib/jekyll/converters/scss.rb:185:in `convert'
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:106:in `block in convert'
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `each'
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `reduce'
16:28:30.914	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:104:in `convert'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:84:in `render_document'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/renderer.rb:63:in `run'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:547:in `render_regenerated'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:539:in `block in render_pages'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:538:in `each'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:538:in `render_pages'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:211:in `render'
16:28:30.915	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/site.rb:80:in `process'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:28:in `process_site'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:65:in `build'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:36:in `process'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `block in process_with_graceful_fail'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `each'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/command.rb:91:in `process_with_graceful_fail'
16:28:30.916	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `block in execute'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `each'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in `execute'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in `go'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in `program'
16:28:30.917	from /opt/buildhome/cache/bundle/ruby/2.7.0/gems/jekyll-4.2.0/exe/jekyll:15:in `<top (required)>'
16:28:30.917	from /opt/buildhome/cache/binstubs/jekyll:29:in `load'
16:28:30.917	from /opt/buildhome/cache/binstubs/jekyll:29:in `<main>'
16:28:30.918	Failed: build command exited with code: 1