Problem
I was persistently getting the error:
Bundler gave the error "Could not find json-1.8.1 in any of the sources" while processing "/Users/tpowell/projects/some_other_project/Gemfile". Perhaps you forgot to run "bundle install"?
While trying to fix a bug in paperclip_database that was similar to Paperclip Gerenator – No Method Error in paperclip
I eventually found an issue referencing this problem in the rbenv github repo.:
It is recommended to not use the rbenv-bundler plugin, as it has been the source of many problems
Solution
I ended up uninstalling the rbenv-bundler plugin as a result.
But hey, kudos to rbenv-bundler author for taking the complaint in stride.