Rbenv warning: line 1: ge#!/usr/bin/env: No such file or directory

Question

I use rbenv for a little while now and I start getting this warning everytime I run a ruby command or when I launch a rake task :

/Users/.../.rbenv/shims/ruby: line 1: ge#!/usr/bin/env: No such file or directory

or

/Users/.../.rbenv/shims/rake: line 1: ge#!/usr/bin/env: No such file or directory

And of course, /usr/bin/env actually exists and works.