Rails + CarrierWave: NoMethodError: undefined method `name' for nil:NilClass

Question

I am using CarrierWave with Rails 3.1. I am getting the following error message when I submit the form (trying to upload an image):

Error Message:

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Answer 1

I came across this post because I had the same error you described, but restarting the server didn't resolve it (as suggested by other answers). In my case, the problem was caused because I used mount_uploader before attr_accessible. By switching them I solved the problem.