title: Puzzled by Rails exception notification system
body: <p>[update2] One of those problems I solved &amp; can't remember how... :)</p>
  
  <p>[update1]  could this be a problem in the model?</p>
  
  <pre><code>  PAYPAL_CERT_PEM = File.read("#{Rails.root}/certs/paypal_cert.pem")
    APP_CERT_PEM = File.read("#{Rails.root}/certs/app_cert.pem")
    APP_KEY_PEM = File.read("#{Rails.root}/certs/app_key.pem")
  </code></pre>
  
  <p>The page I'm trying to access on my site is the cart page for paypal purchases.  Notwithstanding the trouble of getting to this error in the production log amidst an apparent DoS attack, I have no experience working with the exception notifier.  What's being called (by my code) is an encryption method in the model for each 'buy now' button.  Please help me diagnose the problem.</p>
  
  <pre><code>Rendering .../public/500.html (500 Error)
  rendering section "request"
  /!\ FAILSAFE /!\  Fri Jan 16 14:59:54 +0000 2009
    Status: 500 Internal Server Error
  
  ActionView::TemplateError (protected method `filter_parameters' called for #&lt;PurchaseController:0x7f053d26e280&gt;) on line #3 of vendor/plugins/exception_notification/views/exception_notifier/_request.rhtml:
      1: * URL       : &lt;%= @request.protocol %&gt;&lt;%= @host %&gt;&lt;%= @request.request_uri %&gt;
      2: * IP address: &lt;%= @request.env["HTTP_X_FORWARDED_FOR"] || @request.env["REMOTE_ADDR"] %&gt;
      3: * Parameters: &lt;%= filter_sensitive_post_data_parameters(@request.parameters).inspect %&gt;
      4: * Rails root: &lt;%= @rails_root %&gt;
  </code></pre>