Are you using the Kopernicus that comes included in the RSS download? If so, it won’t work. I think you are because module manager 2.8.0 does not work with 1.3.1. Also Kopernicus is version locked. The version included with RSS is for KSP 1.2.2 and will only work with 1.2.2. You need to be using Kopernicus 1.3.1-3. And the latest module manager. There is also a patch in the RSS thread that I posted that makes RSS compatible with 1.3.1. You will need to go through the last couple of pages to find