ArgumentError in PadController#edit

/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:201:in `handleResult'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:45:in `call'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:112:in `getSessionInfo'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:64:in `get_info'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:42:in `valid_until'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:47:in `valid?'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:52:in `expired?'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `perform_action_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:617:in `call_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/rescue.rb:160:in `perform_action_without_flash'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/flash.rb:151:in `perform_action'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `process_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:606:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:391:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:386:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/routing/route_set.rb:438:in `call'

/srv/www/redmine/vendor/plugins/redmine_etherpad/app/controllers/pad_controller.rb:93:in `load_pad'
/srv/www/redmine/vendor/plugins/redmine_etherpad/app/controllers/pad_controller.rb:30:in `edit'
/usr/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:87:in `dispatch'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:121:in `_call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:106:in `call'
/usr/lib/ruby/1.8/rack/adapter/rails.rb:74:in `call'
/usr/lib/ruby/1.8/thin/connection.rb:76:in `pre_process'
/usr/lib/ruby/1.8/thin/connection.rb:74:in `catch'
/usr/lib/ruby/1.8/thin/connection.rb:74:in `pre_process'
/usr/lib/ruby/1.8/thin/connection.rb:57:in `process'
/usr/lib/ruby/1.8/thin/connection.rb:42:in `receive_data'
/usr/lib/ruby/1.8/eventmachine.rb:257:in `run_machine'
/usr/lib/ruby/1.8/eventmachine.rb:257:in `run'
/usr/lib/ruby/1.8/thin/backends/base.rb:57:in `start'
/usr/lib/ruby/1.8/thin/server.rb:156:in `start'
/usr/lib/ruby/1.8/thin/controllers/controller.rb:80:in `start'
/usr/lib/ruby/1.8/thin/runner.rb:174:in `send'
/usr/lib/ruby/1.8/thin/runner.rb:174:in `run_command'
/usr/lib/ruby/1.8/thin/runner.rb:140:in `run!'

/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:201:in `handleResult'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:45:in `call'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/client.rb:112:in `getSessionInfo'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:64:in `get_info'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:42:in `valid_until'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:47:in `valid?'
/var/lib/gems/1.8/gems/etherpad-lite-0.0.4/lib/etherpad-lite/models/session.rb:52:in `expired?'
/srv/www/redmine/vendor/plugins/redmine_etherpad/app/controllers/pad_controller.rb:93:in `load_pad'
/srv/www/redmine/vendor/plugins/redmine_etherpad/app/controllers/pad_controller.rb:30:in `edit'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:1333:in `perform_action_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:617:in `call_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:610:in `perform_action_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/usr/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/var/lib/gems/1.8/gems/activesupport-2.3.11/lib/active_support/core_ext/benchmark.rb:17:in `ms'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/rescue.rb:160:in `perform_action_without_flash'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/flash.rb:151:in `perform_action'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `send'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:532:in `process_without_filters'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/filters.rb:606:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:391:in `process'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/base.rb:386:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/routing/route_set.rb:438:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:87:in `dispatch'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:121:in `_call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/query_cache.rb:29:in `call'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/query_cache.rb:29:in `call'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/query_cache.rb:9:in `cache'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/query_cache.rb:28:in `call'
/var/lib/gems/1.8/gems/activerecord-2.3.11/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/string_coercion.rb:25:in `call'
/var/lib/gems/1.8/gems/rack-1.1.1/lib/rack/head.rb:9:in `call'
/var/lib/gems/1.8/gems/rack-1.1.1/lib/rack/methodoverride.rb:24:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/params_parser.rb:15:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/session/cookie_store.rb:99:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/failsafe.rb:26:in `call'
/var/lib/gems/1.8/gems/rack-1.1.1/lib/rack/lock.rb:11:in `call'
/var/lib/gems/1.8/gems/rack-1.1.1/lib/rack/lock.rb:11:in `synchronize'
/var/lib/gems/1.8/gems/rack-1.1.1/lib/rack/lock.rb:11:in `call'
/var/lib/gems/1.8/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:106:in `call'
/usr/lib/ruby/1.8/rack/adapter/rails.rb:74:in `call'
/usr/lib/ruby/1.8/thin/connection.rb:76:in `pre_process'
/usr/lib/ruby/1.8/thin/connection.rb:74:in `catch'
/usr/lib/ruby/1.8/thin/connection.rb:74:in `pre_process'
/usr/lib/ruby/1.8/thin/connection.rb:57:in `process'
/usr/lib/ruby/1.8/thin/connection.rb:42:in `receive_data'
/usr/lib/ruby/1.8/eventmachine.rb:257:in `run_machine'
/usr/lib/ruby/1.8/eventmachine.rb:257:in `run'
/usr/lib/ruby/1.8/thin/backends/base.rb:57:in `start'
/usr/lib/ruby/1.8/thin/server.rb:156:in `start'
/usr/lib/ruby/1.8/thin/controllers/controller.rb:80:in `start'
/usr/lib/ruby/1.8/thin/runner.rb:174:in `send'
/usr/lib/ruby/1.8/thin/runner.rb:174:in `run_command'
/usr/lib/ruby/1.8/thin/runner.rb:140:in `run!'
/usr/bin/thin1.8:6