Set-up: Unable to set-up i915-infra locally

While setting up i915-infra (after following the README.md) file, I am getting the following error.

$ bundle exec nanoc
Loading site... done
Compiling site...

Captain! We've been hit!

  ... 39 lines omitted (see crash.log for details)
  9. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:44:in `write'
  8. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:156:in `_nanoc_swallow_broken_pipe_errors_while'
  7. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:45:in `block in write'
  6. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:152:in `_nanoc_clean'
  5. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:152:in `reduce'
  4. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:152:in `each'
  3. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/cleaning_stream.rb:152:in `block in _nanoc_clean'
  2. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/stream_cleaners/utf8.rb:12:in `clean'
  1. from /home/kumarm/kumarm/virtualenv/i915-infra/site-publishing/bundle/ruby/2.5.0/gems/nanoc-4.10.3/lib/nanoc/cli/stream_cleaners/utf8.rb:12:in `unicode_normalize'
  /usr/lib/ruby/2.5.0/unicode_normalize/normalize.rb:141:in `normalize'

Encoding::CompatibilityError: Unicode Normalization not appropriate for ASCII-8BIT

crash-file.txt