NoMethodError in Users#show - ruby-on-rails-3

Question

Everytime I try and access the user profile page, I get this error.
ActionView::Template::Error (undefined method `email' for nil:NilClass):
2: <tr>
3: <td class="main">
4: <h1>
5: <%= gravatar_for #user %>
6: <%= #user.name %>
7: </h1>
8: </td>
app/helpers/users_helper.rb:4:in `gravatar_for'
app/views/users/show.html.erb:5:in `_app_views_users_show_html_erb__222181804_33777120'
Below is what my users.controller.rb file looks like.
def show
#user = User.find(params[:id])
#microposts = #user.microposts.paginate(:page => params[:page])
#title = #user.name
For additional reference, below is a copy of my show.html.erb file.
<table class="profile" summary="Profile information">
<tr>
<td class="main">
<h1>
<%= gravatar_for #user %>
<%= #user.name %>
</h1>
</td>
<td class="sidebar round">
<strong>Name</strong> <%= #user.name %><br />
<strong>URL</strong> <%= link_to user_path(#user), #user %>
</td>
</tr>
</table>
Also provided is my users_helper.rb file.
module UsersHelper
def gravatar_for(user, options = { :size => 50 })
gravatar_image_tag(user.email.downcase, :alt => h(user.name),
:class => 'gravatar',
:gravatar => options)
end
end

Answer 1

The error is in your helper method. Please verify that the #user object is not nil.
Then in your view change the line number 5 like this:
<%= gravatar_for(#user) %>
define your users_helper#gravatar_for method like this
def gravatar_for(#user)
..........
#user.email
..........
rerurn somthing #if you want
end