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The engine/plugin application_helper.rb can not be found.
Fixing by renaming the folder app/helpers/CamelCasedName to app/helpers/camel_cased_name
Reproduce with this repository https://github.com/RobertBrewitz/EngineRspecMongoid/tags tagged camelcase-bug.
I'll look on it
fix rails plugin new CamelCasedName bug
bug fixed and merged so it could be closed