rvm fail

Andrew-Grimms-MacBook-Pro:~ agrimm$ rvm install ruby-head
Installing Ruby from source to: /Users/agrimm/.rvm/rubies/ruby-head, this may take a while depending on your cpu(s)...

ruby-head - #fetching 
Cloning from https://github.com/ruby/ruby.git, this may take a while depending on your connection...
Initialized empty Git repository in /Users/agrimm/.rvm/repos/ruby-head/.git/
remote: Counting objects: 31219, done.
remote: Compressing objects: 100% (14314/14314), done.
remote: Total 31219 (delta 23603), reused 22606 (delta 16153)
Receiving objects: 100% (31219/31219), 21.60 MiB | 129 KiB/s, done.
Resolving deltas: 100% (23603/23603), done.
Checking out files: 100% (3543/3543), done.
From https://github.com/ruby/ruby
 * branch            trunk      -> FETCH_HEAD
Already up-to-date.
Copying from repo to src path...
Running autoconf
ruby-head - #configuring 
ruby-head - #compiling 
ruby-head - #installing 
ruby-head - Updating #rubygems to the latest.
ERROR: Cannot switch to 1.5.2 for this interpreter.
ruby-head - Updating #rubygems to the latest.
ERROR: Cannot switch to 1.5.2 for this interpreter.
ruby-head - adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-head - #importing default gemsets (/Users/agrimm/.rvm/gemsets/)
Install of ruby-head - #complete 
Andrew-Grimms-MacBook-Pro:~ agrimm$ rvm --version

rvm 1.2.7 by Wayne E. Seguin ([email protected]) [http://rvm.beginrescueend.com/]