Gem update --system returns "nil to String implicit conversion"

Question

Starting gem update - the system saves the returned error

# gem update --system Updating rubygems-update ERROR: While executing gem ... (TypeError) no implicit conversion of nil into String 

How to fix it?
Verbose: http://pastebin.com/2uBYEMTi

Answer 1

This may be due to incompatible versions of gemstones (maybe a stone that makes remaking monkeys?). Can you try to upgrade one stone?