I got this error, when I tried to run bundle install :
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
bundler (~> 1.7)
Current Bundler version:
bundler (2.0.1)
This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?
Could not find gem 'bundler (~> 1.7)' in any of the relevant sources:
It is because I have installed bundler version 2.0