Getting "ArgumentError ( isn't a valid directory argument.

I'm hoping someone has encountered this before. I'm using AAF trunk and
trying to multi_search across 2 models. It works fine on my windows
(Webricks) dev env but now that i've deployed to linux, (Apache,
FastCGI) I'm getting the following error:

ArgumentError ( isn't a valid directory argument. You should use either
a String or a Directory):
    /vendor/plugins/acts_as_ferret/lib/multi_index.rb:82:in `initialize'
    /vendor/plugins/acts_as_ferret/lib/multi_index.rb:82:in
`ensure_searcher'
    /vendor/plugins/acts_as_ferret/lib/multi_index.rb:51:in
`query_parser'
    /vendor/plugins/acts_as_ferret/lib/multi_index.rb:60:in
`process_query'
    /vendor/plugins/acts_as_ferret/lib/multi_index.rb:26:in
`search_each'
    /vendor/plugins/acts_as_ferret/lib/class_methods.rb:442:in
`id_multi_search'
    /vendor/plugins/acts_as_ferret/lib/class_methods.rb:422:in
`multi_search'
    /app/controllers/search_controller.rb:8:in `query'

Anybody know what might be causing this?

Thanks, Dave

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