Reset button not working

Hello,
I'm new to Ruby. The password reset button no longer works after we
rebooted the server. I get a message we're sorry but something went
wrong. I'm not sure how to resolve this issue.

Here's the code from user_password/new.html.erb
<div id="existing-customer">
  <h1>Reset Your Password</h1>

  <p><%= t(:instructions_to_reset_password) %></p>

  <%= form_for(User.new, :as => :user, :url =>
user_password_path, :html => {:class => "login_form"}) do |f| %>
    <% if @user.errors.any? %>
      <div id="error_explanation">
        <h2><%= pluralize(@user.errors.count, "error") %> prohibited
this contact from being saved:</h2>

        <ul>
        <% @user.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
        </ul>
      </div>
    <% end %>
    <p>
      <label><%= t(:email) %>:</label><br />
      <%= f.email_field :email %>
    </p>

    <%= submit_tag "Reset Password", :class => 'button primary' %>

  <% end %>
</div>

Hello,
I'm new to Ruby. The password reset button no longer works after we
rebooted the server. I get a message we're sorry but something went
wrong. I'm not sure how to resolve this issue.

You should start by looking at your applications log file and seeing
where exactly the problem is occurring.

Fred