Puppet users - Jan 2011 - can't get yaml from 2.6 loaded into 3rd party script

what am i doing wrong?

<0>root@test2(46)~$ cat <<.|/usr/bin/ruby ; echo
$?
> require ''puppet''
> require ''yaml''
>
YAML.load_file(''/var/lib/puppet/client_yaml/catalog/$HOSTNAME.yaml'')
> .
/usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`transfer'': can''t convert Array into String (TypeError)
        from /usr/lib/ruby/1.8/yaml.rb:133:in `each''
        from /usr/lib/ruby/1.8/yaml.rb:133:in `transfer''
        from /usr/lib/ruby/1.8/yaml.rb:133:in `node_import''
        from /usr/lib/ruby/1.8/yaml.rb:133:in `load''
        from /usr/lib/ruby/1.8/yaml.rb:133:in `load''
        from /usr/lib/ruby/1.8/yaml.rb:144:in `load_file''
        from /usr/lib/ruby/1.8/yaml.rb:143:in `open''
        from /usr/lib/ruby/1.8/yaml.rb:143:in `load_file''
        from -:3
1
<0>root@test2(47)~$ rpm -q puppet
puppet-2.6.4-1

<1>root@test1(2)~$ cat <<.|/usr/bin/ruby ; echo
$?
> require ''puppet''
> require ''yaml''
>
YAML.load_file(''/var/lib/puppet/client_yaml/catalog/$HOSTNAME.yaml'')
> .
0
<0>root@test1(3)~$ rpm -q puppet
puppet-0.25.5-1.el5

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