More than one parameter in URL

Hello.

I'm trying to make my site work with OAI-PMH (http:// oai.rubyforge.org/). Whilst running the tests on http://re.cs.uct.ac.za/ it seems that it can't process more than two parameters. For example:

http://mysite.com/oai?verb=Identify works fine, but http://mysite.com/oai?verb=Identify&test=tes end ups with an error with any second parameter

Processing OaiController#index (for 0.0.0.0:3030 at 2010-01-09 00:47:21) [GET]   Parameters: {"verb"=>"Identify", "test"=>"tes"}

TypeError (can't convert nil into Array):   oai (0.0.12) lib/oai/provider/response.rb:67:in `-'   oai (0.0.12) lib/oai/provider/response.rb:67:in `valid?'   oai (0.0.12) lib/oai/provider/response.rb:31:in `initialize'   ...

Line 67 is: return false unless (@options.keys - self.class.valid_options).empty? where, ofcourse, self.class.valid_options is nil. But why? Any thoughts?