ruby Archive:Tar failing to load, Ubuntu 12.04, ruby 1.9.3

/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:17: warning: else without rescue is useless
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:19: warning: `*' interpreted as argument prefix
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:44: warning: mismatched indentations at 'end' with 'case' at 33
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': /var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:15: syntax error, unexpected ':', expecting keyword_then or ',' or ';' or '\n' (SyntaxError)
			when IO: parse(@source, full); @source.rewind
			        ^
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:34: syntax error, unexpected ':', expecting keyword_then or ',' or ';' or '\n'
				when :file:       File.open(path, 'w') { |fio| fio.write(body) }
				           ^
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:35: syntax error, unexpected keyword_when, expecting keyword_end
				when :directory:  FileUtils.mkdir(path)
				    ^
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:36: syntax error, unexpected keyword_when, expecting keyword_end
				when :link:       File.link( File...
				    ^
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:37: syntax error, unexpected keyword_when, expecting keyword_end
				when :symlink:    File.symlink( header[:dest], path )
				    ^
/var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar/reader.rb:45: syntax error, unexpected keyword_end, expecting $end
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
	from /var/lib/gems/1.9.1/gems/archive-tar-0.9.0/lib/archive/tar.rb:108:in `<top (required)>'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:59:in `require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:59:in `rescue in require'
	from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
	from ./vagrant-softlayer-boxes:9:in `<main>'


$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]
$ gem -v
1.8.11

Line 9 is the last require:

require 'rubygems'
require 'archive/tar'