memcache error

Key {"active_record:Airline:flightstats_id:AC"=>"mc1.ec2.northscale.net:11211:8"}
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/memcached-0.19/lib/memcached/memcached.rb:507:in `check_return_code'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/memcached-0.19/lib/memcached/memcached.rb:428:in `get'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/memcached-0.19/lib/memcached/rails.rb:36:in `get'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activesupport-2.3.4/lib/active_support/cache/mem_cache_store.rb:58:in `read'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activesupport-2.3.4/lib/active_support/cache/strategy/local_cache.rb:39:in `read'
/disk1/home/slugs/147547_610059b_33e3/mnt/app/models/airline.rb:47:in `find_by_sql'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:1548:in `find_every'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:1505:in `find_initial'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:613:in `find'
/disk1/home/slugs/147547_610059b_33e3/mnt/app/models/airline.rb:19:in `find'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:1900:in `find_by_flightstats_id'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:1885:in `send'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/activerecord-2.3.4/lib/active_record/base.rb:1885:in `method_missing_without_paginate'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/will_paginate-2.3.11/lib/will_paginate/finder.rb:170:in `method_missing'
/disk1/home/slugs/147547_610059b_33e3/mnt/app/jobs/flightstats/data_feed/transform_file.rb:39:in `to_attrs'
/disk1/home/slugs/147547_610059b_33e3/mnt/app/jobs/flightstats/data_feed/transform_file.rb:12
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/flightstats-0.0.3/lib/flightstats/data_feed/file/sax_parser.rb:118:in `call'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/flightstats-0.0.3/lib/flightstats/data_feed/file/sax_parser.rb:118:in `on_end_element_ns'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/flightstats-0.0.3/lib/flightstats/data_feed/file.rb:23:in `parse'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/flightstats-0.0.3/lib/flightstats/data_feed/file.rb:23:in `updates'
/disk1/home/slugs/147547_610059b_33e3/mnt/app/jobs/flightstats/data_feed/transform_file.rb:10:in `perform'
/disk1/home/slugs/147547_610059b_33e3/mnt/ext/newrelic.rb:25:in `perform'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/resque-1.6.0/lib/resque/worker.rb:148:in `process'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/resque-1.6.0/lib/resque/worker.rb:123:in `work'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/resque-1.6.0/lib/resque/worker.rb:110:in `loop'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/resque-1.6.0/lib/resque/worker.rb:110:in `work'
/home/slugs/147547_610059b_33e3/mnt/.gems/gems/resque-1.6.0/lib/resque/tasks.rb:24
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
/usr/ruby1.8.7/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:607:in `invoke_prerequisites'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `each'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:604:in `invoke_prerequisites'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:596:in `invoke_with_call_chain'
/usr/ruby1.8.7/lib/ruby/1.8/monitor.rb:242:in `synchronize'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
/usr/ruby1.8.7/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31
/usr/ruby1.8.7/bin/rake:19:in `load'
/usr/ruby1.8.7/bin/rake:19