[Rails] how do I fix this?

ruby 1.9.3dev (2010-07-06 trunk 28554) [i686-linux]

Rails 3.0.0.beta4

Fedora Release 13 

Kernel Linux 2.6.33.5-124.fc13.i686.PAE

GNOME 2.30.0

After I scaffold, migrate, link_to posts_path,  and check click on new post I'm presented with this error. Please help...what does it mean and how do I fix it? I downloaded the Getting Started code and replaced the partial file and received a different error..any ideas?

http://localhost:3000/posts/new

I18n::UnknownFileType in Posts#new

Showing /home/user/Desktop/blog/app/views/posts/_form.html.erb where line #15 raised:

Extracted source (around line #15):

12:   <% end %>

13: 

14:   <div class="field">

15:     <%= f.label :name %><br />

16:     <%= f.text_field :name %>

17:   </div>

18:   <div class="field">

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