I need to change the system of skins (in the rocket's head is taken from the license system skins)It's not clear what you want to say. :S
Write in both English and Russian, that might help.
I don't think you can keep Galacticraft from trying to use the player's online skin for the rocket icon. If you are playing online, or don't have a custom skin, you can change the steve.png file in the minecraft version jar itself - go look it up online.I need to change the system of skins (in the rocket's head is taken from the license system skins)