tanker:reindex crashes

gistfile1.txt

$ rake tanker:reindex --trace
** Invoke tanker:reindex (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute tanker:reindex
reindexing all models
Indexing Citizen model
rake aborted!

/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/indextank_client.rb:64:in `execute'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/indextank_client.rb:22:in `PUT'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/indextank_client.rb:143:in `add_documents'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker.rb:65:in `batch_update'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker.rb:312:in `block in tanker_reindex'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker.rb:311:in `each'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker.rb:311:in `each_with_index'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker.rb:311:in `tanker_reindex'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker/utilities.rb:39:in `block in reindex_all_models'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker/utilities.rb:38:in `each'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker/utilities.rb:38:in `reindex_all_models'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bundler/gems/tanker-6f0d0cb82560/lib/tanker/tasks/tanker.rake:7:in `block (2 levels) in <top (required)>'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/usr/share/ruby-rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bin/rake:19:in `load'
/usr/share/ruby-rvm/gems/ruby-1.9.3-p125/bin/rake:19:in `<main>'
Tasks: TOP => tanker:reindex