This error is because there is a planet prototype called "cube1" that is not recognized by this mod as a valid planet. You're using a lot of mods, so it's safe to assume that some other mod put it there, but I don't know which one. Any ideas?
I've made the code that caused this error more robust, so things that show up as planets but aren't actually planets you can teleport to should be better filtered out, but without knowing the specific mod interaction that's really all I can do.