root@Jena-web:/var/www/discourse# rake uploads:migrate_to_s3 --trace
** Invoke uploads:migrate_to_s3 (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute uploads:migrate_to_s3
Migrating uploads to S3 (kazamatsuri) for 'default'...
rake aborted!
TypeError: no implicit conversion of nil into String
/var/www/discourse/lib/tasks/uploads.rake:137:in `exists?'
/var/www/discourse/lib/tasks/uploads.rake:137:in `block in migrate_to_s3'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/relation/batches.rb:51:in `block (2 levels) in find_each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/relation/batches.rb:51:in `each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/relation/batches.rb:51:in `block in find_each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/relation/batches.rb:124:in `find_in_batches'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/activerecord-4.2.4/lib/active_record/relation/batches.rb:50:in `find_each'
/var/www/discourse/lib/tasks/uploads.rake:126:in `migrate_to_s3'
/var/www/discourse/lib/tasks/uploads.rake:105:in `block in migrate_to_s3_all_sites'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rails_multisite-1.0.3/lib/rails_multisite/connection_management.rb:124:in `call'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rails_multisite-1.0.3/lib/rails_multisite/connection_management.rb:124:in `block in each_connection'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rails_multisite-1.0.3/lib/rails_multisite/connection_management.rb:122:in `each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rails_multisite-1.0.3/lib/rails_multisite/connection_management.rb:122:in `each_connection'
/var/www/discourse/lib/tasks/uploads.rake:105:in `migrate_to_s3_all_sites'
/var/www/discourse/lib/tasks/uploads.rake:101:in `block in <top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:150:in `invoke_task'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `each'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:115:in `run_with_threads'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:100:in `top_level'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:78:in `block in run'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling'
/var/www/discourse/vendor/bundle/ruby/2.0.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run'
bin/rake:4:in `<main>'
Tasks: TOP => uploads:migrate_to_s3