Jreviews - Error creating feed file, please check write permissions.

I have the Jreviews installed which created an RSS feed for each section, and each product. If you click on any of the feed links you will get the below error.

Error creating feed file, please check write permissions.

You can see this error by clicking on the RSS icon on this page:

www.expertreviews.com/reviews/web-host-reviews/

The RSS link looks like this:

www.expertreviews.com/reviews/web-host-reviews_c45.rss/

I believe this error is being caused my SEF Advanced. Can anyone possibly elaborate on this issue?

I think you should take it up with jReviews author first as they made extension for their component. It's possible that it's up to SEF Advance too but they will know best.