undefined method ` for nil:NilClass - html

Question

I am trying to display the new form page from another controller's page, I am used nested resources.
I am getting this error
undefined method `sublet_posts' for nil:NilClass
Student Model
class Student < ApplicationRecord
has_many :sublet_posts, :dependent => :destroy
end
Sublet_post model
class SubletPost < ApplicationRecord
belongs_to :student
end
route.rb
resources :students do
resources :sublet_posts
end
Student show view
<p id="notice"><%= notice %></p>
...
...
...
<h3>Sublet Post</h3>
<% #student.sublet_posts.each do |sublet_post| %>
<%= sublet_post.description %>
<%= link_to "Edit", edit_student_sublet_post_path(#student, sublet_post) %>
<% end %>
<h3>Add Sublet Post</h3>
<%= link_to "Add", new_student_sublet_post_path(#student)%>
Sublet_Post Controller
class SubletPostsController < ApplicationController
before_action :set_sublet_post, only: [:edit, :update, :destroy]
# POST /sublet_posts
# POST /sublet_posts.json
def create
#student = Student.find(params[:student_id])
#sublet_post = #student.create(sublet_post_params)
#sublet_post.student_id = current_member_id
redirect_to student_path(#student)
end
# PATCH/PUT /sublet_posts/1
# PATCH/PUT /sublet_posts/1.json
def update
#student = Student.find(params[:student_id])
#sublet_post = #student.sublet_posts.update(sublet_post_params)
redirect_to student_path(#student)
end
private
# Use callbacks to share common setup or constraints between actions.
def set_sublet_post
#sublet_post = SubletPost.find(params[:id])
end
# Only allow a list of trusted parameters through.
def sublet_post_params
params.require(:sublet_post).permit(......)
end
end
Sublet Post form view
<%= form_for [#student, #student.sublet_posts.build] do |form| %>. <----------------- Error
<% if sublet_post.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(sublet_post.errors.count, "error") %> prohibited this sublet_post from being saved:</h2>
<ul>
<% sublet_post.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="actions">
<%= form.submit %>
</div>
<% end %>
Any help will be very appreciated. I didn't think the student controller was needed so I left it out.