Use ruby 1.9.x instead of 1.8.x and you should be good to go. 

I've run into something similar on a client's server (REE 1.8.7 only) and has 
to fix things by hand. 

On Apr 10, 2012, at 9:15 PM, John Moroney <> wrote:

> I thought it might be fun to try a PG install. I'm getting this error on 
> bundleinstall:
> Invalid gemspec in 
> [/Library/Ruby/Gems/1.8/specifications/radiant-1.0.1.gemspec]: Illformed 
> requirement ["#<YAML::Syck::DefaultKey:0x3936ba8> 1.5.1"]
> Does this ring any bells for anyone?

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