LocalDDNS Server is an application developed by Geovision that allows you to connect your surveillance cameras to a PC or to a GV-System. It can map a device name to your POS system’s IP address. For further information, check the page 15 from the official user guide. Also, you need to know that you can't launch the application twice on the same computer. However, with the latest version of DMMultiView software, you can use simultaneously up to 32 DVR/NVR cameras. In order to solve the error, I suggest you remove the old version of the software from your PC, and download and install the latest version from the official web page. Click the Download button next to GV-Multi View, save the file to your computer and install the application following the on-screen instructions. If you still have issues, use the contact information from the official web page to get in touch with the support team.