[Solved]-Installing rubygem d3js into a Rails 5 app, receiving railties compatibility issues-d3.js

Successfully installed found no issues. Suggestion: Try to update your rubygem manager, rails & installed gems if they are not up to date. It seems you are having compatibility issues with your gems. gem update --system && gem update

Otherwise: use

gem 'rails', '~> 4.2', '>= 4.2.7.1'
gem 'sass-rails', '~> 4.0', '>= 4.0.5'
gem 'coffee-rails', '~> 4.0', '>= 4.0.1'
gem 'react-rails', '~> 1.8', '>= 1.8.2'

instead of your current version then use

bundle update

and then

bundle install.

Hope this will work. Good Luck!