Error Root Element is Missing

Why am I getting ‘Error System Xml.XmlException:  Root element is missing’? This error occurred in the older Rockton Software Report Engine Versions. If you are using the Rockton Software Report Engine older than Version 1.0.0.8, please download the latest build of DRM from our website (https://www.rocktonsoftware.com/gp/resources/product-downloads) and install it. This build includes an updated Rockton Software Report Engine and Crystal Viewer.