Psych error using rbenv, ruby 1.9.3-p194 and rails 3.2.6

gistfile1.txt

/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin11.4.0/psych.bundle: warning: already initialized constant ANY
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin11.4.0/psych.bundle: warning: already initialized constant UTF8
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin11.4.0/psych.bundle: warning: already initialized constant UTF16LE
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/x86_64-darwin11.4.0/psych.bundle: warning: already initialized constant UTF16BE
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/stream.rb:12: warning: already initialized constant ANY
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/stream.rb:15: warning: already initialized constant UTF8
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/stream.rb:18: warning: already initialized constant UTF16LE
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/stream.rb:21: warning: already initialized constant UTF16BE
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/sequence.rb:42: warning: already initialized constant ANY
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/sequence.rb:45: warning: already initialized constant BLOCK
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/sequence.rb:48: warning: already initialized constant FLOW
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:9: warning: already initialized constant ANY
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:12: warning: already initialized constant PLAIN
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:15: warning: already initialized constant SINGLE_QUOTED
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:18: warning: already initialized constant DOUBLE_QUOTED
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:21: warning: already initialized constant LITERAL
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/scalar.rb:24: warning: already initialized constant FOLDED
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/mapping.rb:16: warning: already initialized constant ANY
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/mapping.rb:19: warning: already initialized constant BLOCK
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/nodes/mapping.rb:22: warning: already initialized constant FLOW
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/visitors/visitor.rb:10: warning: already initialized constant DISPATCH
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/scalar_scanner.rb:8: warning: already initialized constant TIME
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/scalar_scanner.rb:11: warning: already initialized constant FLOAT
/Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/parser.rb:33:in `<class:Parser>': superclass mismatch for class Mark (TypeError)
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/parser.rb:32:in `<module:Psych>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych/parser.rb:1:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych.rb:7:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/1.9.1/psych.rb:7:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/ordered_hash.rb:2:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/ordered_hash.rb:2:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/core_ext/enumerable.rb:1:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/core_ext/enumerable.rb:1:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/attribute_methods.rb:1:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/attribute_methods.rb:1:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record.rb:96:in `<module:ActiveRecord>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record.rb:31:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/railtie.rb:1:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/railtie.rb:1:in `<top (required)>'
	from /Users/jacortinas/projects/chattr/config/application.rb:4:in `require'
	from /Users/jacortinas/projects/chattr/config/application.rb:4:in `<top (required)>'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands.rb:39:in `require'
	from /Users/jacortinas/.rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands.rb:39:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'

I found this via the google. Same thing is happening to me.

I fixed it by adding gem 'psych' to my Gemfile. See if that helps you.

I did gem uninstall psych to make the errors stop.

That's pretty funny, 2 solutions doing opposite things. 👍

Probably related to: ruby/psych#66