error while trying to push database to heroku

I am trying to do a

$heroku db:push

this is the error I get

C:/Ruby/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/utils.rb:138:in `union': can't convert Array into
String (TypeError)
        from C:/Ruby/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/utils.rb:138
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/Ruby/lib/ruby/gems/1.8/gems/taps-0.3.9/lib/taps/multipart.rb:2
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from C:/Ruby/lib/ruby/gems/1.8/gems/taps-0.3.9/lib/taps/data_stream.rb:2
        from C:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
         ... 8 levels...
        from C:/Ruby/lib/ruby/gems/1.8/gems/heroku-1.9.11/lib/heroku/command.rb:20:in `run'
        from C:/Ru开发者_运维百科by/lib/ruby/gems/1.8/gems/heroku-1.9.11/bin/heroku:13
        from C:/Ruby/bin/heroku:19:in `load'
        from C:/Ruby/bin/heroku:19

It is a brand new MySQL development database, the taps gem is installed. I have pushed this same database to multiple other heroku apps, those have all been deleted.

Have you checked the version of rack gem?

try making it rack (1.0.1)

i.e gem uninstall rack <version number>
then gem install rack 1.0.1

Hope this helps,

Regards,

Saurabh