Got the solution a restart of server or server reset fixed the problem
If any one gets this problem make sure the engine loads while starting server or you can add require to application.rb
Question
Getting this error on server
NameError
uninitialized constant Dragonfly::Server::Serializer
Using debian+passenger+apache+Rails 3.2 + ruby 1.9.3
La solution
Got the solution a restart of server or server reset fixed the problem
If any one gets this problem make sure the engine loads while starting server or you can add require to application.rb