Having the following Error: NoMethodError in Posts#show

I keep getting the following error. I'm trying to develop my own blogging platform as a way for me to learn and get better.

Showing /home/ubuntu/workspace/app/views/posts/show.html.erb where line #36 raised:

undefined method `post_comments_path' for

<#:0x007f88f0044248> Did you mean? posts_path

<h2>Add a comment:</h2>
<%= form_for([@post, @post.comments.build]) do |f| %>
  <div class="field">
    <%= f.label :author %><br />
    <%= f.text_field :author %>