Path is not a folder error.

Hello,

I am experiencing an error using Joomla and Payplans. When I go to create a new notification email, or edit an existing one I am met with this error:

Warning Joomla\CMS\Filesystem\Folder::files: Path is not a folder. Path: [ROOT]/media/com_payplans/emails/attachments

Any insight on how to resolve this error would be much appreciated.

Thank you for your time,
Grady