我试图将一个Rails应用程序推送到Heroku，但是不断收到这个错误。
user$ git push heroku master
Initializing repository, done.
Counting objects: 158, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (144/144), done.
Writing objects: 100% (158/158), 671.52 KiB | 160.00 KiB/s, done.
Total 158 (delta 32), reused 0 (delta 0)
-----> Ruby app detected
-----> Compiling Ruby/Rails
!
! An error occurred while installing Ruby ruby-2.1.1
! For supported Ruby versions see https://devcenter.heroku.com/articles/ruby-support#supported-runtimes
! Note: Only the most recent version of Ruby 2.1 is supported on Cedar-14
! Command: 'set -o pipefail; curl --fail --retry 3 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/cedar-14/ruby-2.1.1.tgz -s -o - | tar zxf - ' failed unexpectedly:
!
! gzip: stdin: unexpected end of file
! tar: Child returned status 1
! tar: Error is not recoverable: exiting now
!
! Push rejected, failed to compile Ruby app
To git@heroku.com:user.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'git@heroku.com:user.git'
我在 Stack Overflow 上研究了一些可能的解决方案，但似乎都没有奏效。我尝试销毁 Heroku 应用程序，然后重新创建它，并尝试使用不同的 Ruby 版本，但这也似乎没有起作用。