Docker image cannot build the website today

awestruct@640be87e290d:/site$ rake clean preview
sed: can't read vendor/bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/page.rb: No such file or directory
Using profile: development
Generating site: http://localhost:4242
While processing file
An error occurred: /site/docs/connectors/sqlserver.asciidoc is not valid US-ASCII
/site/.bundle/ruby/2.3.0/gems/tilt-2.0.8/lib/tilt/template.rb:95:in `initialize'
/site/.bundle/ruby/2.3.0/gems/tilt-2.0.8/lib/tilt/mapping.rb:138:in `new'
/site/.bundle/ruby/2.3.0/gems/tilt-2.0.8/lib/tilt/mapping.rb:138:in `new'
/site/.bundle/ruby/2.3.0/gems/tilt-2.0.8/lib/tilt.rb:43:in `new'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handlers/asciidoctor_handler.rb:136:in `parse_document_attributes'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handlers/asciidoctor_handler.rb:130:in `parse_header'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handlers/asciidoctor_handler.rb:46:in `front_matter'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handlers/asciidoctor_handler.rb:40:in `initialize'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handler_chain.rb:20:in `new'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handler_chain.rb:20:in `block in create'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handler_chain.rb:19:in `each'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/handler_chain.rb:19:in `create'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/page_loader.rb:68:in `load_page'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/page_loader.rb:46:in `block in load_all'
/usr/local/lib/ruby/2.3.0/pathname.rb:563:in `block in find'
/usr/local/lib/ruby/2.3.0/find.rb:49:in `block (2 levels) in find'
/usr/local/lib/ruby/2.3.0/find.rb:48:in `catch'
/usr/local/lib/ruby/2.3.0/find.rb:48:in `block in find'
/usr/local/lib/ruby/2.3.0/find.rb:43:in `each'
/usr/local/lib/ruby/2.3.0/find.rb:43:in `find'
/usr/local/lib/ruby/2.3.0/pathname.rb:563:in `find'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/page_loader.rb:25:in `load_all'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/engine.rb:394:in `load_pages'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/engine.rb:88:in `run'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/cli/generate.rb:22:in `run'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/cli/invoker.rb:150:in `invoke_generate'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/lib/awestruct/cli/invoker.rb:74:in `invoke!'
/site/.bundle/ruby/2.3.0/gems/awestruct-0.5.7/bin/awestruct:9:in `<top (required)>'
/site/.bundle/ruby/2.3.0/bin/awestruct:23:in `load'
/site/.bundle/ruby/2.3.0/bin/awestruct:23:in `<top (required)>'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli/exec.rb:74:in `load'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli/exec.rb:74:in `kernel_load'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli/exec.rb:28:in `run'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli.rb:424:in `exec'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli.rb:27:in `dispatch'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/cli.rb:18:in `start'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/exe/bundle:30:in `block in <top (required)>'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/usr/local/lib/ruby/gems/2.3.0/gems/bundler-1.16.3/exe/bundle:22:in `<top (required)>'
/usr/local/bundle/bin/bundle:23:in `load'
/usr/local/bundle/bin/bundle:23:in `<main>'
*************************************************************************
Starting preview server at http://0.0.0.0:4242 (Press Ctrl-C to shutdown)
*************************************************************************

07:51:47 - INFO - LiveReload is waiting for a browser to connect.
[2018-07-30 07:51:50] INFO  WEBrick 1.3.1
[2018-07-30 07:51:50] INFO  ruby 2.3.7 (2018-03-28) [x86_64-linux]
[2018-07-30 07:51:50] INFO  WEBrick::HTTPServer#start: pid=841 port=4242