我正在尝试在Heroku上为我正在开发的应用程序托管Canvas LMS，而且我遇到了部署它的问题。
Canvas LMS使用Ruby 2.1.6，这不是Heroku上的默认Ruby。我进入了Gemfile，添加了这一行ruby "2.1.6"，当我将它部署到Heroku时，我得到了这个错误：
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote: !
remote: ! An error occurred while installing Ruby Ruby-2.3-support-is-untested-ruby-2.3.1
remote: ! For supported Ruby versions see https://devcenter.heroku.com/articles/ruby-support#supported-runtimes
remote: ! Note: Only the most recent version of Ruby 2.1 is supported on Cedar-14
remote: ! Command: 'set -o pipefail; curl -L --fail --retry 3 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/cedar-14/Ruby-2.3-support-is-untested-ruby-2.3.1.tgz -s -o - | tar zxf - ' failed unexpectedly:
remote: !
remote: ! gzip: stdin: unexpected end of file
remote: ! tar: Child returned status 1
remote: ! tar: Error is not recoverable: exiting now
remote: !
remote: ! Push rejected, failed to compile Ruby app.
remote:
remote: ! Push failed
我没有使用Ruby的经验，所以我真的不知道如何修补并解决问题。无处不在，我看起来只是将ruby "2.1.6"行添加到我的Gemfile中，但这还没有解决问题。