gistfile1.txt

$ bake db:create          
/Users/qrush/.rvm/gems/ruby-1.9.2-p290/gems/psych-1.2.1/lib/psych.rb:93: warning: already initialized constant VERSION
/Users/qrush/.rvm/gems/ruby-1.9.2-p290/gems/psych-1.2.1/lib/psych.rb:96: warning: already initialized constant LIBYAML_VERSION
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin10.8.0/psych.bundle: warning: already initialized constant ANY
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin10.8.0/psych.bundle: warning: already initialized constant UTF8
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin10.8.0/psych.bundle: warning: already initialized constant UTF16LE
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin10.8.0/psych.bundle: warning: already initialized constant UTF16BE
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/stream.rb:12: warning: already initialized constant ANY
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/stream.rb:15: warning: already initialized constant UTF8
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/stream.rb:18: warning: already initialized constant UTF16LE
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/stream.rb:21: warning: already initialized constant UTF16BE
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/sequence.rb:42: warning: already initialized constant ANY
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/sequence.rb:45: warning: already initialized constant BLOCK
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/sequence.rb:48: warning: already initialized constant FLOW
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:9: warning: already initialized constant ANY
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:12: warning: already initialized constant PLAIN
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:15: warning: already initialized constant SINGLE_QUOTED
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:18: warning: already initialized constant DOUBLE_QUOTED
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:21: warning: already initialized constant LITERAL
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/scalar.rb:24: warning: already initialized constant FOLDED
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/mapping.rb:16: warning: already initialized constant ANY
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/mapping.rb:19: warning: already initialized constant BLOCK
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/nodes/mapping.rb:22: warning: already initialized constant FLOW
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/scalar_scanner.rb:8: warning: already initialized constant TIME
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych/deprecated.rb:4: warning: already initialized constant DEPRECATED
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych.rb:92: warning: already initialized constant VERSION
/Users/qrush/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/psych.rb:95: warning: already initialized constant LIBYAML_VERSION

You ever figure this out? Got a friend with the same problem...

I just fixed this. The solution is to install the latest psych gem system-wide.

rvm use 1.9.3
gem uninstall psych
gem install psych

version 1.3.2 or later worked for me.