我对这类事情没有多少经验，但希望有人可以提供帮助。我相信我已安装了bundler，但是当我运行setup.rb文件来安装OpenProject时，我一直收到错误，即没有安装bundler。当我运行gem list和捆绑列表时，它会为两者生成一个列表。我错过了什么？
$ setup.rb
==> Installing OpenProject...
==> Checking Ruby Version
==> It seems you are not running the recommended patch level.
==> To avoid unexpected problems we would recommend to install 'ruby 1.8.7 (2012-10-12 patchlevel 371)'
==> Checking Bundler
The system cannot find the path specified.
==> It seems bundler is not installed. Please install bundler before running set
up.rb.
==> For bundler and more information visit: http://gembundler.com/
==> Something went wrong :(
==> Installation aborted.