I am unable to build and submit the app to testflight. I am getting the following error
^D^Dchruby: unknown Ruby: 2.4.2
Warning: the running version of Bundler (1.15.1) is older than the version that created the lockfile (1.16.0). We suggest you upgrade to the latest version of Bundler by running
gem install bundler.
Your Ruby version is 2.0.0, but your Gemfile specified 2.4.2
Exited with code 18