thanks for purchasing and using my plugin. From reading through your post, it seems like something strange is happening with the slashes. I think you might have typed "mediaSermons_HomeRecent_Sermons" instead of "media/Sermons_Home/Recent_Sermons" in your folder location in the Plugin Managers. So, basically, use forward slashes instead of backslashes.
If that doesn't solve your problem, then you may have to provide me with two things:
The exact value you have set for "Location of the Listing Folder" in the Plugin Manager.
A link to your website, or rather the specific page that has the listing (so that I can see and examine it for myself)
I should be able to help you with that information. You can send it to my email address, if you don't want to post it here.