报错，求助 #13
Description
╰─ jekyll server --watch ─╯
Configuration file: /home/github/simple/_config.yml
Dependency Error: Yikes! It looks like you don't have jekyll-feed or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem. If you've run Jekyll with bundle exec, ensure that you have included the jekyll-feed gem in your Gemfile as well. The full error message from Ruby is: 'cannot load such file -- jekyll-feed' If you run into trouble, you can find helpful resources at https://jekyllrb.com/help/!
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Jekyll 4.2.2 Please append --trace to the serve command
for any additional information or backtrace.
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/var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:73:in rescue in block in require_with_graceful_fail': jekyll-feed (Jekyll::Errors::MissingDependencyException) from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:58:in block in require_with_graceful_fail'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:57:in each' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:57:in require_with_graceful_fail'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/plugin_manager.rb:30:in require_gems' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/plugin_manager.rb:22:in conscientious_require'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/site.rb:131:in setup' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/site.rb:36:in initialize'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/build.rb:30:in new' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/build.rb:30:in process'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in block in process_with_graceful_fail' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in each'
from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in process_with_graceful_fail' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/serve.rb:86:in block (2 levels) in init_with_program'
from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in block in execute' from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in each'
from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in execute' from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in go'
from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in program' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/exe/jekyll:15:in <top (required)>'
from /usr/local/bin/jekyll:25:in load' from /usr/local/bin/jekyll:25:in
/var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:60:in
require': cannot load such file -- jekyll-feed (LoadError) from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:60:in block in require_with_graceful_fail'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:57:in
each' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/external.rb:57:in require_with_graceful_fail'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/plugin_manager.rb:30:in
require_gems' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/plugin_manager.rb:22:in conscientious_require'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/site.rb:131:in
setup' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/site.rb:36:in initialize'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/build.rb:30:in
new' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/build.rb:30:in process'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in
block in process_with_graceful_fail' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in each'from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/command.rb:91:in
process_with_graceful_fail' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/lib/jekyll/commands/serve.rb:86:in block (2 levels) in init_with_program'from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in
block in execute' from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in each'from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/command.rb:221:in
execute' from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary/program.rb:44:in go'from /var/lib/gems/3.0.0/gems/mercenary-0.4.0/lib/mercenary.rb:21:in
program' from /var/lib/gems/3.0.0/gems/jekyll-4.2.2/exe/jekyll:15:in <top (required)>'from /usr/local/bin/jekyll:25:in
load' from /usr/local/bin/jekyll:25:in '