YM4R spatial adapter problem

Anybody got fixtures to work with the YM4R spatial adapter? I'm trying the syntax used on the docs --
geom: <%= Point.from_x_y(123.5,321.9).to_yaml %> -- trying but getting a yaml error:

Fixture::FormatError: a YAML error occured parsing /home/christ/backyard/devsite/backyard/config/../test/fixtures/items.yml. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Please have a look at http://www.yaml.org/faq.html
The exact error was:
  ArgumentError: Bad fixture argument false
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:311:in `read_fixture_files'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:279:in `initialize'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:251:in `create_fixtures'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:250:in `create_fixtures'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:794:in `silence'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:248:in `create_fixtures'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:565:in `load_fixtures'
    /usr/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/fixtures.rb:512:in `setup'

Needless to say, there are no tabs in the doc, and it passes without the geom line. Anyone able to help?