[Bug]: Error: undefined method `excerpt_separator' for #<Jekyll::Page> #9544

bundle exec jekyll build --safe

Run bundle exec jekyll build --safe
Calling `DidYouMean::SPELL_CHECKERS.merge!(error_name => spell_checker)' has been deprecated. Please call `DidYouMean.correct_error(error_name, spell_checker)' instead.
Configuration file: /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/_config.yml
To use retry middleware with Faraday v2.0+, install `faraday-retry` gem
            Source: /home/runner/work/remarkablemark.github.io/remarkablemark.github.io
       Destination: /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/_site
 Incremental build: disabled. Enable with --incremental
      Generating... 
       Jekyll Feed: Generating feed for posts
jekyll 3.9.4 | Error:  undefined method `excerpt_separator' for #<Jekyll::Page @name="404.md">

      head, _, tail = doc_content.to_s.partition(doc.excerpt_separator)
                                                    ^^^^^^^^^^^^^^^^^^
/home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/excerpt.rb:135:in `extract_excerpt': undefined method `excerpt_separator' for #<Jekyll::Page @name="404.md"> (NoMethodError)

      head, _, tail = doc_content.to_s.partition(doc.excerpt_separator)
                                                    ^^^^^^^^^^^^^^^^^^
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/excerpt.rb:25:in `initialize'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:173:in `new'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:173:in `replace_relative_links_excerpt!'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:[6](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:7)4:in `replace_relative_links!'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.[7](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:8).0/lib/jekyll-relative-links/generator.rb:44:in `block in generate'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:39:in `each'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:39:in `generate'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:175:in `block in generate'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:173:in `each'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:173:in `generate'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:70:in `process'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/command.rb:2[8](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:9):in `process_site'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.[9](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:10).4/lib/jekyll/commands/build.rb:65:in `build'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/commands/build.rb:36:in `process'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/commands/build.rb:18:in `block (2 levels) in init_with_program'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `block in execute'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/exe/jekyll:15:in `<top (required)>'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/bin/jekyll:25:in `load'
	from /home/runner/work/remarkablemark.github.io/remarkablemark.github.io/vendor/bundle/ruby/3.1.0/bin/jekyll:25:in `<top (required)>'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli/exec.rb:63:in `load'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli/exec.rb:63:in `kernel_load'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli/exec.rb:28:in `run'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli.rb:476:in `exec'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:[12](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:13)7:in `invoke_command'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor.rb:399:in `dispatch'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli.rb:30:in `dispatch'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/vendor/thor/lib/thor/base.rb:476:in `start'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/cli.rb:24:in `start'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/exe/bundle:46:in `block in <top (required)>'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/lib/bundler/friendly_errors.rb:1[23](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:24):in `with_friendly_errors'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/lib/ruby/gems/3.1.0/gems/bundler-2.1.4/exe/bundle:34:in `<top (required)>'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/bin/bundle:[25](https://github.com/remarkablemark/remarkablemark.github.io/actions/runs/7820440961/job/21335167976?pr=71#step:4:26):in `load'
	from /opt/hostedtoolcache/Ruby/3.1.2/x64/bin/bundle:25:in `<main>'
Error: Process completed with exit code 1.

git clone https://github.com/remarkablemark/remarkablemark.github.io.git
cd remarkablemark.github.io

git checkout jekyll-error-undefined-method-excerpt_separator

bundle exec jekyll build --safe