I can't add skins or save skins to my Minecraft Launcher.

So, I try and add a skin and it will not let me it says the following, "Unable to save skin". I don't know why it is staying this. Then when I try to add it to my current library it says the following, "Unable to duplicate skin". I don't understand why it says unable to duplicate skin I don't have the same skin or the same name as this skin. I would really appreciate it if you can help fix this problem. Please give a good response saying what is causing this problem. Thanks so much and keep on working!

I have tried to attach some pictures, but it won't let me. Please Help Me!