rubygems - gem を ruby​​gems にプッシュする際のエラー (Psych::SyntaxError)

Question

やってみrake releaseましたが、ハングします..

次に、これを見るhttp://help.rubygems.org/discussions/problems/7607-rake-release-hangs-on-new-gem-submission

作成された.gemを削除してビルドしました

gem build mygem.gemspec

そして、作成されたgemをgem pushしようとしました

C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): control characters are not allowed at line 1 column 1 (Psych::SyntaxError)
        from C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse_stream'
        from C:/Ruby193/lib/ruby/1.9.1/psych.rb:151:in `parse'
        from C:/Ruby193/lib/ruby/1.9.1/psych.rb:127:in `load'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:318:in `load_file'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:270:in `load_api_keys'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:286:in `rubygems_api_key'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/gemcutter_utilities.rb:31:in `sign_in'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/commands/push_command.rb:39:in `execute'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command.rb:305:in `invoke_with_build_args'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command_manager.rb:170:in `process_args'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command_manager.rb:130:in `run'
        from C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/gem_runner.rb:60:in `run'
        from C:/Ruby193/bin/gem:21:in `<main>'

ruby 1.9.3 と最新の ruby​​gems 2.0.7 を使用

gem をプッシュするにはどうすればよいですか?