<p>After upgrading a rails 1.2 website to 2.1, the <a href="http://agilewebdevelopment.com/plugins/exception_notifier" rel="noreferrer">ExceptionNotifier plugin</a> no longer works, complaining about this error:</p>

<blockquote>
  <p>ActionView::TemplateFinder::InvalidViewPath:  Unprocessed view path
  found:
  "/path/to/appname/vendor/plugins/exception_notification/lib/../views".
  Set your view paths with #append_view_path, #prepend_view_path, or #view_paths=.</p>
</blockquote>

<p>What causes it and how do I fix it?</p>

This was caused by a change in rails 2.1 which prevents rails from loading views from any arbitrary path for security reasons.
There is now an updated version of the plugin on github, so the solution is to use that.
The old solution here for posterity
To work around it, edit
```
init.rb
```
under your
```
vendor/plugins/exception_notification
```
directory, and add the following code to the end
```
```
ActionController::Base.class_eval do
  append_view_path File.dirname(__FILE__) + '/lib/../views'
end
```
```
This adds the ExceptionNotifier plugins' views folder to the list, so it is allowed to load them.