Ironruby core - Sep 2009 - Error when installing Watir for IronRuby

I updated my gem for Ruby (Not IronRuby) to 1.3.5


C:\DevTools\IronRuby\ironruby\Merlin\Main\Languages\Ruby\Scripts\bin>ir
igem -v
1.3.5

C:\DevTools\IronRuby\ironruby\Merlin\Main\Languages\Ruby\Scripts\bin>ir
igem ins
tall watir
ERROR:  While executing gem ... (RangeError)
    bignum too big to convert into Fixnum

Any ideas about the above error?
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