Html5 - W3C validation errors - Rails(Embedded Ruby) - ruby-on-rails

Question

Kindly guide me to solve these errors in sign up and login views
<div class="jumbotronsignup">
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4 labelcolor">
<h3>SIGN UP</h3>
<%= form_for(#user) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.label :name %>
<%= f.text_field :name, autofocus: true , class: 'form-control' %>
<%= f.label :email %>
<%= f.text_field :email, class: 'form-control' %>
<%= f.label :password %>
<%= f.password_field :password, autocomplete: "off", class: 'form-control' %>
<%= f.label :password_confirmation, "Password Confirmation" %>
<%= f.password_field :password_confirmation, autocomplete: "off", class: 'form-control' %>
<div>
<%= f.label :is_female, "Gender" %>
<%= f.select :is_female, User::GENDER_TYPES , {}, { :class => 'form-control' } %>
</div>
<div>
<%= f.label :date_of_birth, :class=>'singleline' %>
<%= f.date_select :date_of_birth, { :start_year => 1920, :end_year => 2010 }, :class => 'form-control date-select datetest' %>
</div>
<div>
<%= f.label :avatar , "Profile Picture" %>
<%= f.file_field :avatar, accept: 'image/jpeg,image/gif,image/png,image/tiff', class: 'form-control' %>
</div>
<div class="row text-center">
<%= f.submit "Create my account", class: "btn mybtn-primary btn-lg" %>
</div>
<% end %>
</div>
</div>
</div><!-- end of container -->
</div><!-- end of jumbotron -->
How can I solve this error?
And this is my login page
<div class="jumbotronsignup">
<div class="container">
<div class="row">
<div class="col-md-4 col-md-offset-4 labelcolor">
<h3>LOG IN</h3>
<%= form_for(:session, url: login_path) do |f| %>
<%= f.label :email %>
<%= f.text_field :email, class: 'form-control' %>
<%= f.label :password %>
<%= link_to "(forgot password)", new_password_reset_path %>
<%= f.password_field :password, class: 'form-control' %>
<%= f.label :remember_me, class: "checkbox inline" do %>
<%= f.check_box :remember_me %>
<span>Remember me on this computer</span>
<% end %>
<div class="row text-center">
<%= f.submit "Log in", class: "btn mybtn-primary btn-lg" %>
<p>New user? <%= link_to "Sign up now!", signup_path %></p>
</div>
<% end %>
</div>
</div>
</div><!-- end of container -->
</div><!-- end of jumbotron -->