ruby - Ruby SFTP が「Net::SSH::Disconnect: disconnected: Failed to read binary packet data! (2)」を返す

Question

私はルビー1.9.3でこれを持っています:

Net::SFTP.start(ENV['SFTP_HOST'], ENV['SFTP_USERNAME'], password: ENV['SFTP_PASSWORD'], key_data: [ENV['SFTP_KEY']], keys_only: true) do |sftp|
  sftp.upload!(StringIO.new("testing"), "/text.txt")
end

認証ステップを正しく実行しているように見えますが (ディレクトリ内のファイルを一覧表示できます)、upload!上記のようなコマンドを実行すると、次のように返されます。

Net::SSH::Disconnect: disconnected: Failed to read binary packet data! (2)
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/transport/session.rb:176:in `block in poll_message'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/transport/session.rb:166:in `loop'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/transport/session.rb:166:in `poll_message'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:451:in `dispatch_incoming_packets'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:213:in `preprocess'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:197:in `process'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:161:in `block in loop'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:161:in `loop'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-ssh-2.5.2/lib/net/ssh/connection/session.rb:161:in `loop'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-sftp-2.0.5/lib/net/sftp/session.rb:802:in `loop'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-sftp-2.0.5/lib/net/sftp/operations/upload.rb:195:in `wait'
from /Users/barmstrong/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/net-sftp-2.0.5/lib/net/sftp/session.rb:103:in `upload!'

私も試しました

    # open and write to a pseudo-IO for a remote file
    sftp.file.open("/test.txt", "wb") do |f|
      f.puts "testing"
    end

バイナリファイルを書き込もうとするが、うまくいかない。

何か案は？ありがとう！