Ruby on rails 3 运行db:pull时出错

我在运行heroku db:pull-a my app时遇到问题。我得到这个信息：

!    Heroku client internal error.
!    Search for help at: https://help.heroku.com
!    Or report a bug at: https://github.com/heroku/heroku/issues/new

Error:       constant URI::WFKV_ not defined (NameError)
Backtrace:   /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backports/uri/common_192.rb:53:in `remove_const'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backports/uri/common_192.rb:53:in `<module:URI>'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backports/uri/common_192.rb:19:in `<top (required)>'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/utils.rb:12:in `require'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/utils.rb:12:in `<top (required)>'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/multipart.rb:2:in `require'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/multipart.rb:2:in `<top (required)>'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/data_stream.rb:2:in `require'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/data_stream.rb:2:in `<top (required)>'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/operation.rb:8:in `require'
             /home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/operation.rb:8:in `<top (required)>'
             /usr/local/heroku/lib/heroku/command/db.rb:207:in `require'
             /usr/local/heroku/lib/heroku/command/db.rb:207:in `load_taps'
             /usr/local/heroku/lib/heroku/command/db.rb:49:in `pull'
             /usr/local/heroku/lib/heroku/command.rb:206:in `run'
             /usr/local/heroku/lib/heroku/cli.rb:28:in `start'
             /usr/local/heroku/bin/heroku:25:in `<main>'

Command:     heroku db:pull -a my-app
Version:     heroku-toolbelt/2.33.2 (i486-linux) ruby/1.9.1

！Heroku客户端内部错误。
!    在以下位置搜索帮助：https://help.heroku.com
!    或在以下位置报告错误：https://github.com/heroku/heroku/issues/new
错误：常量URI:：WFKV_uu未定义（NameError）
回溯：/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backport/uri/common_192.rb:53:in'remove_const'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backport/uri/common_192.rb:53:in`'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/backport/uri/common_192.rb:19:in`'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/utils.rb:12:in'require'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/rack-1.4.1/lib/rack/utils.rb:12:in`'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/multipart.rb:2:in'require'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/multipart.rb:2:in`'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/data_stream.rb:2:in'require'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/data_stream.rb:2:in`'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/operation.rb:8:in'require'
/home/user/.rvm/gems/ruby-1.9.2-p320@cg/gems/taps-0.3.24/lib/taps/operation.rb:8:in`'
/usr/local/heroku/lib/heroku/command/db.rb:207:在'require'中
/usr/local/heroku/lib/heroku/command/db.rb:207:in'load_taps'
/usr/local/heroku/lib/heroku/command/db.rb:49:in'pull'
/usr/local/heroku/lib/heroku/command.rb:206:在“run”中
/usr/local/heroku/lib/heroku/cli.rb:28:in'start'
/usr/local/heroku/bin/heroku:25:in`'
命令：heroku db:pull-a我的应用程序
版本：heroku toolbelt/2.33.2（i486 linux）ruby/1.9.1

也有同样的问题。似乎db:pull已被弃用

看