I have Oxwall installed and have WordPress installed in a subdirectory as follows.  http://mydomain.com/blog

I want to add the rss feed from my WordPress blog to my Oxwall main page, but I keep receiving an error from the RSS widget that the URL is invalid.

I've tried other WordPress rss feeds on other domains and they work fine, but I keep getting an invalid URL error when I enter
http://mydomain.com/blog/feed into the Oxwall rss widget

Any suggestions or help would be greatly appreciated.