Error: Process completed with exit code 6. about example-services HOT 2 OPEN

When I add a new post on my blog, I got an error during the build.

But when I check my status using "bundle install". I don't know what is wrong....

bundle install
Using public_suffix 4.0.6
Using addressable 2.7.0
Using bundler 2.1.4
Using colorator 1.1.0
Using concurrent-ruby 1.1.7
Using eventmachine 1.2.7
Using http_parser.rb 0.6.0
Using em-websocket 0.5.2
Using ffi 1.13.1
Using ethon 0.12.0
Using forwardable-extended 2.6.0
Using mercenary 0.4.0
Using mini_portile2 2.4.0
Using nokogiri 1.10.10
Using nokogumbo 2.0.4
Using parallel 1.20.1
Using rainbow 3.0.0
Using typhoeus 1.4.0
Using yell 2.2.2
Using html-proofer 3.17.4
Using i18n 1.8.5
Using sassc 2.4.0
Using jekyll-sass-converter 2.1.0
Using rb-fsevent 0.10.4
Using rb-inotify 0.10.1
Using listen 3.3.3
Using jekyll-watch 2.2.1
Using rexml 3.2.4
Using kramdown 2.3.0
Using kramdown-parser-gfm 1.1.0
Using liquid 4.0.3
Using pathutil 0.16.2
Using rouge 3.26.0
Using safe_yaml 1.0.5
Using unicode-display_width 1.7.0
Using terminal-table 1.8.0
Using jekyll 4.1.1
Using jekyll-paginate 1.1.0
Using jekyll-redirect-from 0.16.0
Using jekyll-seo-tag 2.6.1
Bundle complete! 5 Gemfile dependencies, 40 gems now installed.
Bundled gems are installed into ./vendor/bundle

Does anyone help me?

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