I added the Better Errors gem to my gemfile like as seen in my gemfile below, and ran bundle and saw Using better_errors 1.1.0 and restarted my server several t
I am running vagrant, rails 5 and ruby 2.3 and I added the below to my config/environments/development.rb and got it working.
# Allow usage of better_errors on Vagrant
BetterErrors::Middleware.allow_ip! "10.0.2.2"
# Show full error reports and disable caching.
config.consider_all_requests_local = true
Same answers as above but just wanted to confirm it for anyone running the rails 5 beta.