Gem cleanup not working

'gem cleanup' deletes one element, then fails. This can be repeated.

Any idea ?
_md

..........

Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Michel>gem cleanup
Cleaning up installed gems...
Attempting to uninstall sourcify-0.4.2
Successfully uninstalled sourcify-0.4.2
Attempting to uninstall slop-1.5.3
Unable to uninstall slop-1.5.3:
        Gem::InstallError: gem "slop" is not installed

.....

many more lines

....

Attempting to uninstall ZenTest-4.5.0
Unable to uninstall ZenTest-4.5.0:
        Gem::InstallError: gem "ZenTest" is not installed
Clean Up Complete

···

-------
Again :
-------

C:\Documents and Settings\Michel>gem cleanup
Cleaning up installed gems...
Attempting to uninstall slop-1.5.3
Successfully uninstalled slop-1.5.3
Attempting to uninstall slop-1.9.1
Unable to uninstall slop-1.9.1:
        Gem::InstallError: gem "slop" is not installed
Attempting to uninstall simplecov-html-0.4.4
Unable to uninstall simplecov-html-0.4.4:
        Gem::InstallError: gem "simplecov-html" is not installed

----------
and so on ...
----------

C:\Documents and Settings\Michel>gem env
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.7
  - RUBY VERSION: 1.9.2 (2011-07-09 patchlevel 290) [i386-mingw32]
  - INSTALLATION DIRECTORY: C:/Ruby192/lib/ruby/gems/1.9.1
  - RUBY EXECUTABLE: C:/Ruby192/bin/ruby.exe
  - EXECUTABLE DIRECTORY: C:/Ruby192/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-mingw32
  - GEM PATHS:
     - C:/Ruby192/lib/ruby/gems/1.9.1
     - C:/Documents and Settings/Michel/.gem/ruby/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

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This has already been reported

Sorry for the noise

_md

···

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