exception_message: undefined method `[]' for nil:NilClass
/var/rails/canvas/lib/canvas_migration/migrator.rb:109:in `download_archive'
/var/rails/canvas/lib/canvas_migration/migrator.rb:39:in `initialize'
/var/rails/canvas/lib/cc/importer/cc_converter.rb:32:in `initialize'
/var/rails/canvas/lib/cc/importer/cc_worker.rb:30:in `new'
/var/rails/canvas/lib/cc/importer/cc_worker.rb:30:in `perform'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/backend/base.rb:87:in `invoke_job'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:123:in `perform'
/usr/lib/ruby/1.8/timeout.rb:62:in `timeout'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:123:in `perform'
/usr/lib/ruby/1.8/benchmark.rb:308:in `realtime'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:122:in `perform'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:95:in `run'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:194:in `configure_for_job'
/usr/lib/ruby/1.8/tmpdir.rb:129:in `mktmpdir'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:192:in `configure_for_job'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:94:in `run'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:69:in `start'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:68:in `loop'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/worker.rb:68:in `start'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:118:in `spawn_worker'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:115:in `fork'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:115:in `spawn_worker'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:102:in `spawn_all_workers'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:102:in `times'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:102:in `spawn_all_workers'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:100:in `each'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:100:in `spawn_all_workers'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:70:in `start'
/var/rails/canvas/vendor/plugins/delayed_job/lib/delayed/pool.rb:44:in `run'
/var/rails/canvas/script/delayed_job:5