mongo3 cannot start (fattr 2.1.0 error)

[clyfe]

gem install mongo3

Successfully installed mongo3-0.1.3
1 gem installed
Installing ri documentation for mongo3-0.1.3...
Installing RDoc documentation for mongo3-0.1.3...

cat ~/.mongo3/landscape.yml

development:
host: localhost
port: 27017

mongo3

/usr/local/rvm/gems/ruby-1.9.2-head/gems/fattr-2.1.0/lib/fattr.rb:85:in block (2 levels) in fattrs': wrong number of arguments (1 for 0) (ArgumentError) from /usr/local/rvm/gems/ruby-1.9.2-head/gems/fattr-2.1.0/lib/fattr.rb:90:ininstance_eval'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/fattr-2.1.0/lib/fattr.rb:90:in call' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/fattr-2.1.0/lib/fattr.rb:90:inblock (2 levels) in fattrs'
from (eval):3:in call' from (eval):3:inarity!'
from (eval):4:in arity' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/parameter.rb:105:insanity_check!'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/parameter.rb:101:in initialize' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/parameter.rb:53:inblock in create'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/parameter.rb:53:in instance_eval' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/parameter.rb:53:increate'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/program/class_methods.rb:193:in option' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/mongo3-0.1.3/bin/mongo3:8:inblock in <top (required)>'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/program/class_methods.rb:61:in module_eval' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/program/class_methods.rb:61:inbuild'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/factories.rb:16:in run' from /usr/local/rvm/gems/ruby-1.9.2-head/gems/main-4.2.0/lib/main/factories.rb:25:inMain'
from /usr/local/rvm/gems/ruby-1.9.2-head/gems/mongo3-0.1.3/bin/mongo3:7:in <top (required)>' from /usr/local/rvm/gems/ruby-1.9.2-head/bin/mongo3:19:inload'
from /usr/local/rvm/gems/ruby-1.9.2-head/bin/mongo3:19:in `

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