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All commands in irb give "NoMethodError: undefined` write 'method for nil: NilClass "

I am trying to get the current Ruby version from IRB, but this gives me this error:

>> RUBY_VERSION NoMethodError: undefined method `write' for nil:NilClass from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `printf' from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `output_value' from /usr/local/lib/ruby/1.9.1/irb.rb:160:in `block (2 levels) in eval_input' from /usr/local/lib/ruby/1.9.1/irb.rb:273:in `signal_status' from /usr/local/lib/ruby/1.9.1/irb.rb:156:in `block in eval_input' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb.rb:155:in `eval_input' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:166:in `block (2 levels) in irb' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:165:in `catch' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:165:in `block in irb' Maybe IRB bug!

ruby -v shows ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.2.0]

I am using Mac OS X Lion

UPDATE: Actually, it does not start anything.

 >> a = 'Hello, World!' NoMethodError: undefined method `write' for nil:NilClass from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `printf' from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `output_value' from /usr/local/lib/ruby/1.9.1/irb.rb:160:in `block (2 levels) in eval_input' from /usr/local/lib/ruby/1.9.1/irb.rb:273:in `signal_status' from /usr/local/lib/ruby/1.9.1/irb.rb:156:in `block in eval_input' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch' from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement' from /usr/local/lib/ruby/1.9.1/irb.rb:155:in `eval_input' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:166:in `block (2 levels) in irb' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:165:in `catch' from /usr/local/lib/ruby/1.9.1/irb/ext/multi-irb.rb:165:in `block in irb' Maybe IRB bug!

UPDATE # 2: (for a tin man) Using / usr / bin / irb, I get

 >> 5+5 NoMethodError: undefined method `write' for nil:NilClass from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:310:in `printf' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:310:in `output_value' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:159:in `eval_input' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:271:in `signal_status' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:155:in `eval_input' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/ruby-lex.rb:244:in `each_top_level_statement' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in `loop' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/ruby-lex.rb:230:in `each_top_level_statement' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in `catch' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb/ruby-lex.rb:229:in `each_top_level_statement' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:154:in `eval_input' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:71:in `start' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:70:in `catch' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/irb.rb:70:in `start' from /usr/bin/irb:13 Maybe IRB bug!!
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Try /usr/bin/irb to go on to install Apple Ruby.

Installing Ruby on Lion using instructions for Leopard is not a good idea. You must remember that languages ​​and OS data are changing.

Information in Building Ruby 1.9.3 on Lion with Xcode 4.2 using. / configure --with-gcc = clang "should help. Also," Installation error 1.9.3 from RVM to Lion "has useful information about Xcode.

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