GemInstaller

I have a mysterious error: I try to run gem update and I get a bunch of GemInstaller errors:

sudo gem update -V
Updating installed gems
Exception during cache_data handling: TypeError - invalid Gem::Specification format ["1.1.1", 3, "geminstaller", #<Gem::Version "0.4.2">, Thu Jun 19 03:00:00 -0400 2008, "Automated Gem installation, activation, and much more!", #<Gem::Requirement:0x1a64b30 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, #<Gem::Requirement:0x1a64a68 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, "ruby", [], "geminstaller", "thewoolleyman@gmail.com", ["Chad Woolley"], "Automated Gem installation, activation, and much more!  == FEATURES:  GemInstaller provides automated installation, loading and activation of RubyGems.  It uses a simple YAML config file to:  * Automatically install the correct versions of all required gems wherever your app runs. * Automatically ensure installed gems and versions are consistent across multiple applications, machines, platforms, and environments  * Automatically activate correct versions of gems on the ruby load path when your app runs ('require_gem'/'gem') * Automatically reinstall missing dependency gems (built in to RubyGems &gt; 1.0) * Automatically detect correct platform to install for multi-platform gems (built in to RubyGems &gt; 1.0) * Print YAML for \"rogue gems\" which are not specified in the current config, to easily bootstrap your config file, or find gems that were manually installed without GemInstaller. * Allow for common configs to be reused across projects or environments by supporting multiple config files, including common config file snippets, and defaults with overrides. * Allow for dynamic selection of gems, versions, and platforms to be used based on environment vars or any other logic. * Avoid the \"works on demo, breaks on production\" syndrome * Solve world hunger, prevent the global energy crisis, and wash your socks.  == SYNOPSYS:", "    by Chad Woolley", true, "ruby"]
Cache file was: /opt/local/lib/ruby/gems/1.8/latest_source_cache
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/specification.rb:271:in `_load'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:190:in `load'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:190:in `read_cache_data'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:120:in `cache_data'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:224:in `refresh'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:223:in `each'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:223:in `refresh'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:41:in `cache'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:78:in `search'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:75:in `execute'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command.rb:136:in `invoke'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:104:in `process_args'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:74:in `run'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:39:in `run'
	/opt/local/bin/gem:24
Missing metadata for 3318 gems
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR:  Unable to fetch Marshal.4.8.Z: invalid Gem::Specification format ["1.1.1", 3, "geminstaller", #<Gem::Version "0.4.2">, Thu Jun 19 03:00:00 -0400 2008, "Automated Gem installation, activation, and much more!", #<Gem::Requirement:0x4d4fc84 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, #<Gem::Requirement:0x4d4fbbc @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, "ruby", [], "geminstaller", "thewoolleyman@gmail.com", ["Chad Woolley"], "Automated Gem installation, activation, and much more!  == FEATURES:  GemInstaller provides automated installation, loading and activation of RubyGems.  It uses a simple YAML config file to:  * Automatically install the correct versions of all required gems wherever your app runs. * Automatically ensure installed gems and versions are consistent across multiple applications, machines, platforms, and environments  * Automatically activate correct versions of gems on the ruby load path when your app runs ('require_gem'/'gem') * Automatically reinstall missing dependency gems (built in to RubyGems &gt; 1.0) * Automatically detect correct platform to install for multi-platform gems (built in to RubyGems &gt; 1.0) * Print YAML for \"rogue gems\" which are not specified in the current config, to easily bootstrap your config file, or find gems that were manually installed without GemInstaller. * Allow for common configs to be reused across projects or environments by supporting multiple config files, including common config file snippets, and defaults with overrides. * Allow for dynamic selection of gems, versions, and platforms to be used based on environment vars or any other logic. * Avoid the \"works on demo, breaks on production\" syndrome * Solve world hunger, prevent the global energy crisis, and wash your socks.  == SYNOPSYS:", "    by Chad Woolley", true, "ruby"]
ERROR:  Unable to fetch Marshal.4.8: invalid Gem::Specification format ["1.1.1", 3, "geminstaller", #<Gem::Version "0.4.2">, Thu Jun 19 03:00:00 -0400 2008, "Automated Gem installation, activation, and much more!", #<Gem::Requirement:0x3198b94 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, #<Gem::Requirement:0x3198900 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, "ruby", [], "geminstaller", "thewoolleyman@gmail.com", ["Chad Woolley"], "Automated Gem installation, activation, and much more!  == FEATURES:  GemInstaller provides automated installation, loading and activation of RubyGems.  It uses a simple YAML config file to:  * Automatically install the correct versions of all required gems wherever your app runs. * Automatically ensure installed gems and versions are consistent across multiple applications, machines, platforms, and environments  * Automatically activate correct versions of gems on the ruby load path when your app runs ('require_gem'/'gem') * Automatically reinstall missing dependency gems (built in to RubyGems &gt; 1.0) * Automatically detect correct platform to install for multi-platform gems (built in to RubyGems &gt; 1.0) * Print YAML for \"rogue gems\" which are not specified in the current config, to easily bootstrap your config file, or find gems that were manually installed without GemInstaller. * Allow for common configs to be reused across projects or environments by supporting multiple config files, including common config file snippets, and defaults with overrides. * Allow for dynamic selection of gems, versions, and platforms to be used based on environment vars or any other logic. * Avoid the \"works on demo, breaks on production\" syndrome * Solve world hunger, prevent the global energy crisis, and wash your socks.  == SYNOPSYS:", "    by Chad Woolley", true, "ruby"]
Updating ParseTree
Exception during cache_data handling: TypeError - invalid Gem::Specification format ["1.1.1", 3, "geminstaller", #<Gem::Version "0.4.2">, Thu Jun 19 03:00:00 -0400 2008, "Automated Gem installation, activation, and much more!", #<Gem::Requirement:0xf4201d0 @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, #<Gem::Requirement:0xf4200cc @requirements=[[">=", #<Gem::Version "0">]], @version=nil>, "ruby", [], "geminstaller", "thewoolleyman@gmail.com", ["Chad Woolley"], "Automated Gem installation, activation, and much more!  == FEATURES:  GemInstaller provides automated installation, loading and activation of RubyGems.  It uses a simple YAML config file to:  * Automatically install the correct versions of all required gems wherever your app runs. * Automatically ensure installed gems and versions are consistent across multiple applications, machines, platforms, and environments  * Automatically activate correct versions of gems on the ruby load path when your app runs ('require_gem'/'gem') * Automatically reinstall missing dependency gems (built in to RubyGems &gt; 1.0) * Automatically detect correct platform to install for multi-platform gems (built in to RubyGems &gt; 1.0) * Print YAML for \"rogue gems\" which are not specified in the current config, to easily bootstrap your config file, or find gems that were manually installed without GemInstaller. * Allow for common configs to be reused across projects or environments by supporting multiple config files, including common config file snippets, and defaults with overrides. * Allow for dynamic selection of gems, versions, and platforms to be used based on environment vars or any other logic. * Avoid the \"works on demo, breaks on production\" syndrome * Solve world hunger, prevent the global energy crisis, and wash your socks.  == SYNOPSYS:", "    by Chad Woolley", true, "ruby"]
Cache file was: /opt/local/lib/ruby/gems/1.8/source_cache
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/specification.rb:271:in `_load'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:190:in `load'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:190:in `read_cache_data'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:183:in `read_all_cache_data'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:276:in `search_with_source'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/source_info_cache.rb:86:in `search_with_source'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/dependency_installer.rb:77:in `find_gems_with_sources'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/dependency_installer.rb:154:in `find_spec_by_name_and_version'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/dependency_installer.rb:173:in `install'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:86:in `execute'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:82:in `each'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:82:in `execute'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command.rb:136:in `invoke'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:104:in `process_args'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:74:in `run'
	/opt/local/lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:39:in `run'
	/opt/local/bin/gem:24
ERROR:  While executing gem ... (Gem::GemNotFoundException)
    could not find ParseTree locally or in a repository

However, I don't have GemInstaller installed:

aasm (0.0.2)
action_profiler (1.0.0)
actionmailer (2.1.0)
actionpack (2.1.0)
actionwebservice (1.2.6)
activemerchant (1.3.2)
activerecord (2.1.0)
activeresource (2.1.0)
activesupport (2.1.0)
annotate-models (1.0.2)
arrayfields (4.5.0)
attributes (5.0.1)
bj (1.0.1)
builder (2.1.2)
capistrano (2.4.0)
capistrano-ext (1.2.0)
cgi_multipart_eof_fix (2.5.0)
cheat (1.2.1)
chronic (0.2.3)
color-tools (1.3.0)
columnize (0.1)
daemons (1.0.9)
desert (0.2.1)
facets (2.4.1)
fastercsv (1.2.3)
fastthread (1.0.1)
ferret (0.11.6)
gem_plugin (0.2.3)
highline (1.4.0)
hoe (1.5.3)
hpricot (0.6)
htmlentities (4.0.0)
image_science (1.1.3)
lightrail (0.5.0)
linecache (0.42)
main (2.8.0)
mechanize (0.6.11)
mime-types (1.15)
mislav-will_paginate (2.3.2)
money (1.7.1)
mongrel (1.1.1)
mongrel_cluster (1.0.5)
needle (1.3.0)
net-scp (1.0.1)
net-sftp (2.0.1)
net-ssh (2.0.2)
net-ssh-gateway (1.0.0)
newgem (0.23.1)
orderedhash (0.0.4)
packet (0.1.5)
ParseTree (2.0.2)
ParseTreeReloaded (0.0.1)
pdf-writer (1.1.3)
piston (1.3.3)
plugin_dependencies (0.1.1)
radiant (0.6.4)
rails (2.1.0)
rails_analyzer_tools (1.4.0)
railsmachine (1.0.0)
rake (0.8.1)
RedCloth (3.0.4)
rflickr (2006.02.01)
rspec (1.1.3)
rubigen (1.3.1)
ruby-debug (0.10.1)
ruby-debug-base (0.10.1)
ruby-postgres (0.7.1.2006.04.06)
ruby2ruby (1.1.7)
rubyforge (1.0.0)
rubygems-update (1.1.0)
RubyInline (3.6.5)
RubyInlineAcceleration (0.0.1)
sake (1.0.11)
scrubyt (0.3.4)
sources (0.0.1)
sqlite (2.0.1)
sqlite-ruby (2.2.3)
syntax (1.0.0)
SyslogLogger (1.4.0)
systemu (1.2.0)
transaction-simple (1.4.0)
tzinfo (0.3.5)
uuid (1.0.4)
webrat (0.2.0)
will_paginate (2.2.2)

I grepped and tried to locate GemInstaller on my machine, but I couldn't. Looks like the RubyForge spec is wrong??