Liquid Exception: Failed to get header

[brainsik]

I removed all my gems, installed bundler, and then ran bundle install on a fresh clone. Getting this:

$ gem install bundler
Fetching: bundler-1.12.5.gem (100%)
Successfully installed bundler-1.12.5
Parsing documentation for bundler-1.12.5
Installing ri documentation for bundler-1.12.5
Done installing documentation for bundler after 3 seconds
1 gem installed
$ bundle install
Fetching gem metadata from http://rubygems.org/
Fetching version metadata from http://rubygems.org/
Fetching dependency metadata from http://rubygems.org/
Installing i18n 0.7.0
Using json 1.8.3
Installing minitest 5.8.3
Installing thread_safe 0.3.5
Installing addressable 2.4.0
Installing sass 3.4.20
Installing thor 0.19.1
Installing colorator 0.1
Installing colored 1.2
Installing ffi 1.9.10 with native extensions
Installing mercenary 0.3.5
Installing mini_portile2 2.0.0
Installing parallel 1.6.1
Installing yell 2.0.5
Installing rb-fsevent 0.9.7
Installing kramdown 1.9.0
Installing liquid 3.0.6
Installing rouge 1.10.1
Installing safe_yaml 1.0.4
Installing jekyll-paginate 1.1.0
Installing posix-spawn 0.3.11 with native extensions
Installing yajl-ruby 1.2.1 with native extensions
Using bundler 1.12.5
Installing tzinfo 1.2.2
Installing jekyll-sass-converter 1.4.0
Installing bourbon 4.2.6
Installing ethon 0.8.0
Installing rb-inotify 0.9.5
Installing nokogiri 1.6.7.1 with native extensions
Installing pygments.rb 0.6.3
Installing activesupport 4.2.5
Installing typhoeus 0.8.0
Installing listen 3.0.5
Installing html-proofer 2.6.1
Installing jekyll-watch 1.3.0
Installing jekyll 3.0.1
Bundle complete! 6 Gemfile dependencies, 36 gems now installed.
Use `bundle show [gemname]` to see where a bundled gem is installed.
$ jekyll serve
Configuration file: /Users/brainsik/Projects/jekyll/simplest/_config.yml
            Source: source
       Destination: _site
 Incremental build: disabled. Enable with --incremental
      Generating... 
  Liquid Exception: Failed to get header. in /Users/brainsik/Projects/jekyll/simplest/source/_posts/2015-11-12-lorem.markdown
jekyll 3.0.1 | Error:  Failed to get header.