我使用ubuntu 19.04。

jekyll v 3.0 我在做什么错

ilya@ilya-TM1701:~/Desktop/prsng.ru$ bundle exec jekyll s 
/var/lib/gems/2.5.0/gems/jekyll-3.0.0/lib/jekyll/hooks.rb:54: warning: constant ::Fixnum is   deprecated
Configuration file: /home/ilya/Desktop/prsng.ru/_config.yml
        Source: /home/ilya/Desktop/prsng.ru
   Destination: /home/ilya/Desktop/prsng.ru/_site
Incremental build: disabled. Enable with --incremental
  Generating... 
     AutoPages: Disabled/Not configured in site.config.
bundler: failed to load command: jekyll (/usr/local/bin/jekyll)
NoMethodError: undefined method `validate_data!' for #<Jekyll:Page @name="index.html">