There seemed to be some paperclip updates that broke this stone. There are pending tensile requests, but until they are accepted and the new gem has not been released, you can refer to the updated stone in your Gemfile as follows:
gem 'delayed_paperclip', :git => 'git://github.com/tommeier/delayed_paperclip.git', :ref => '98a8b9e0c24d24c94e2c9c39a704c1b07c5c4d6b'
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