Jekyll在主题更改后投放空白

Question

宝石文件：

source "https://rubygems.org"

gem "jekyll", "~> 3.8.4"

gem "jekyll-sitemap"

gem "jekyll-theme-architect", "0.1.1"

group :jekyll_plugins do
  gem "jekyll-feed", "~> 0.6"
end

gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem "wdm", "~> 0.1.0" if Gem.win_platform?

_config.yml：

title: Your awesome title
email: your-email@example.com
description: >- # this means to ignore newlines until "baseurl:"
  Write an awesome description for your new site here. You can edit this
  line in _config.yml. It will appear in your document head meta (for
  Google search results) and in your feed.xml site description.
baseurl: "" # the subpath of your site, e.g. /blog
url: "" # the base hostname & protocol for your site, e.g. http://example.com
twitter_username: jekyllrb
github_username:  jekyll

# Build settings
markdown: kramdown
theme: jekyll-theme-architect
plugins:
  - jekyll-feed
  - jekyll-sitemap

Did：

• bundle install
• bundle exec jekyll serve

现在当我按下localhost：4000时，我得到一个空白页面

我在做什么错？据我所知，我遵循Jekyll网站上所有设置主题的指示。