help me correct this wrongly syntaxed form_with block

The problem I was having is params press_release was missing This is an attempt at adding it that draws a sytax error
<%= form_with model: @press_release, url: create_user_tour_press_release_path(press_release: { tour_id: @tour.id, artist_id: @artist.id, poster_type: 'User' }) do |f| %>