twitter: [Rails] Re: AssociationTypeMismatch: RoleType expected, got RoleType

ActiveRecord::AssociationTypeMismatch in ClistingsController#create

Category(#-612714068) expected, got String(#-607696388)

Rails.root: /home/gbolahan/sites/spotvilla
Application Trace | Framework Trace | Full Trace

app/controllers/clistings_controller.rb:45:in `new'
app/controllers/clistings_controller.rb:45:in `create'

i have implemented collection select but i intend to create a new new
model with my Clisting model.
how do i get around this error.

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