When render a partial form like:

<%= render :partial => "form", :locals => { :f => f } %>

this causes an error


{code}
ActionView::TemplateError (Expected kind of Outputter, got NilClass):
    In app/views/oauth_clients/_form.html.erb


    /var/lib/gems/1.9.1/gems/log4r-1.1.8/lib/log4r/logger.rb:120:in `each'
    /var/lib/gems/1.9.1/gems/log4r-1.1.8/lib/log4r/logger.rb:120:in `add'
    app/views/oauth_clients/new.html.erb:14:in `block in _run_erb_app47views47oauth_clients47new46html46erb'
    app/views/oauth_clients/new.html.erb:1
    <internal:prelude>:8:in `synchronize'
    /usr/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
    /usr/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
    /usr/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'
{code}


I found this related issue:

http://dev.rubyonrails.org/ticket/3512