Cannot get destroy checkpoint to work

When I run the rails server, open up my app, and get to a "Posts" show
page, I receive multiple errors.  I have been trying to figure them out
for the last few hours.  Everytime I try to fix one thing, I break more
things!  Including the comments checkpoint.  I had it working before,
now it is completey busted.

Can you please take a look.  I imagine the problems have to do
with the following files:

posts_controller (show action)
comments_controller (create action)
app/views/posts/show.html.erb
app/view/comments/_comment.html.erb

It is a mess!  Thanks.