TypeError - no implicit conversion of nil into String: (gem) carrierwave-0.8.0/lib/carrierwave/uploader/cache.rb:159:in cache_path' (gem) carrierwave-0.8.0/lib/carrierwave/uploader/cache.rb:131:inb...

Carrierwave with Rails 3.2.13, TypeError - no implicit conversion of nil into String · Issue #1079 · carrierwaveuploader/carrierwave