Jekyll Build Problem

[dkposthumus]

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Hello; I am having a problem deploying my github pages website. Two weeks ago, I had no problem deploying it, but now I'm getting a constant error. In particular, the log of my action/error looks like this:
Run bundle exec jekyll build --baseurl "/danielposthumus.github.io"
Configuration file: /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/_config.yml
To use retry middleware with Faraday v2.0+, install faraday-retry gem
Source: /home/runner/work/danielposthumus.github.io/danielposthumus.github.io
Destination: /home/runner/work/danielposthumus.github.io/danielposthumus.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="about.md">

/home/runner/work/danielposthumus.github.io/danielposthumus.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="about.md"> (NoMethodError)

  head, _, tail = doc_content.to_s.partition(doc.excerpt_separator)
                                                ^^^^^^^^^^^^^^^^^^
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/excerpt.rb:25:in `initialize'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.[7](https://github.com/dkposthumus/danielposthumus.github.io/actions/runs/7895301961/job/21547461778#step:5:8).0/lib/jekyll-relative-links/generator.rb:173:in `new'
from /home/runner/work/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:64:in `replace_relative_links!'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-relative-links-0.7.0/lib/jekyll-relative-links/generator.rb:44:in `block in generate'
from /home/runner/work/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:173:in `each'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:173:in `generate'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/site.rb:70:in `process'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/lib/jekyll/command.rb:2[8](https://github.com/dkposthumus/danielposthumus.github.io/actions/runs/7895301961/job/21547461778#step:5:9):in `process_site'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.[9](https://github.com/dkposthumus/danielposthumus.github.io/actions/runs/7895301961/job/21547461778#step:5:10).4/lib/jekyll/commands/build.rb:65:in `build'
from /home/runner/work/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.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/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `each'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/command.rb:220:in `execute'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary/program.rb:42:in `go'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/mercenary-0.3.6/lib/mercenary.rb:19:in `program'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/gems/jekyll-3.9.4/exe/jekyll:15:in `<top (required)>'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/bin/jekyll:25:in `load'
from /home/runner/work/danielposthumus.github.io/danielposthumus.github.io/vendor/bundle/ruby/3.1.0/bin/jekyll:25:in `<top (required)>'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli/exec.rb:58:in `load'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli/exec.rb:58:in `kernel_load'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli/exec.rb:23:in `run'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli.rb:451:in `exec'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/vendor/thor/lib/thor/command.rb:28:in `run'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/vendor/thor/lib/thor.rb:527:in `dispatch'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli.rb:34:in `dispatch'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/vendor/thor/lib/thor/base.rb:584:in `start'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/cli.rb:28:in `start'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/exe/bundle:28:in `block in <top (required)>'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/lib/bundler/friendly_errors.rb:[11](https://github.com/dkposthumus/danielposthumus.github.io/actions/runs/7895301961/job/21547461778#step:5:12)7:in `with_friendly_errors'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/lib/ruby/gems/3.1.0/gems/bundler-2.5.3/exe/bundle:20:in `<top (required)>'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/bin/bundle:25:in `load'
from /opt/hostedtoolcache/Ruby/3.1.4/x64/bin/bundle:25:in `<main>'
  head, _, tail = doc_content.to_s.partition(doc.excerpt_separator)
                                                ^^^^^^^^^^^^^^^^^^

Error: Process completed with exit code 1.

I have consulted ChatGPT, which keeps telling me there's something wrong with how I reference the 'excerpt_separator' in my markdown files; however, I don't define the excerpt_separator anywhere, and ChatGPT also says that it's not necessary to set up a markdown file.

I am relatively new to Github and coding in general, so please be patient with me. I appreciate any and all help. Thank you!

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