Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'

[bearded]

Ubuntu 10.04, rvm 1.12.0 (stable), installing ruby 1.9.3

ubuntu@ubuntu:~$ rvm install 1.9.3
Fetching yaml-0.1.4.tar.gz to /home/ubuntu/.rvm/archives
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  460k  100  460k    0     0   134k      0  0:00:03  0:00:03 --:--:--  216k
Extracting yaml-0.1.4.tar.gz to /home/ubuntu/.rvm/src
Prepare yaml in /home/ubuntu/.rvm/src/yaml-0.1.4.
Configuring yaml in /home/ubuntu/.rvm/src/yaml-0.1.4.
Compiling yaml in /home/ubuntu/.rvm/src/yaml-0.1.4.
Installing yaml to /home/ubuntu/.rvm/usr
Installing Ruby from source to: /home/ubuntu/.rvm/rubies/ruby-1.9.3-p125, this may take a while depending on your cpu(s)...

ruby-1.9.3-p125 - #fetching 
ruby-1.9.3-p125 - #downloading ruby-1.9.3-p125, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 9505k  100 9505k    0     0   677k      0  0:00:14  0:00:14 --:--:-- 1288k
ruby-1.9.3-p125 - #extracting ruby-1.9.3-p125 to /home/ubuntu/.rvm/src/ruby-1.9.3-p125
ruby-1.9.3-p125 - #extracted to /home/ubuntu/.rvm/src/ruby-1.9.3-p125
ruby-1.9.3-p125 - #configuring 
ruby-1.9.3-p125 - #compiling 
ruby-1.9.3-p125 - #installing 
Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'.
'ruby' was not found, cannot install rubygems unless ruby is present (Do you have an RVM ruby installed & selected?)
ruby-1.9.3-p125 - adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.9.3-p125 - #importing default gemsets (/home/ubuntu/.rvm/gemsets/)
Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'.
Error running '' under ,
please read /home/ubuntu/.rvm/log/ruby-1.9.3-p125/gemsets.initial.log
Install of ruby-1.9.3-p125 - #complete 
Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'.

ubuntu@ubuntu:~$ cat /home/ubuntu/.rvm/log/ruby-1.9.3-p125/gemsets.initial.log
[2012-04-09 23:11:50] '/home/ubuntu/.rvm/scripts/gemsets' initial # under ruby-1.9.3-p125
'gem' was not found, cannot perform gem actions (Do you have an RVM ruby selected?)

[bearded]

sorry for duplicate :)