I had this problem when I tried to bundle install. This causes from System Environment Variables which RubyMine is using is different from you shell and LANG is default to US-ASCII.
You can fix this (For 10.6+) by add LANG=en_US.UTF-8 to ~/.MacOSX/enviroment.plist
Please checkout How to modify enviroment.plist without any additional tools
This link and this link explain it really well and concise
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This error message from chef is not very useful FATAL: Chef::Exceptions::ChildConvergeError: Chef run process exited unsuccessfully (exit ...