Installing unf_ext 0.0.7.2 not working

Question

So when I try running bundle install --without production it tells me that I am getting an error and that I need to Make sure that gem install unf_ext -v

Answer 1

I ran into this deploying to a remote box. As suggested in comments, I was able to fix it by opening a console session on the affected box and running:

gem update rails
gem install unf_ext -v '0.0.7.2'

And I was then able to deploy successfully.