[Plugin: Robots Meta] Missing rss.png file in robots meta installation

When using the robots meta management console, it requests the following file from the server:
​/wp-includes​/images​/rss.png

However, this file does not exist.

The referrer is:
http://www.mysite.com/wp/wp-content/plugins/robots-meta/yst_plugin_tools.css?ver=2.9.1

I hope this is helpful in resolving the problem.
Best wishes
Hal