fatal: could not read Username for 'https://github.com': terminal prompts disabled

[RossComputerGuy]

Failed to install due to this error:

x seoul256.vim:
    Cloning into '/home/ross/.vim/plugged/seoul256.vim'...
    fatal: could not read Username for 'https://github.com': terminal prompts disabled

In my .vimrc/.config/nvim/init.vim (Removed extra stuff to make it easier to follow):

call plug#begin('~/.vim/plugged')
  Plug 'anned20/vimsence'

  Plug 'junegunn/seoul256.vim'
  Plug 'junegunn/vim-easy-align'
call plug#end()

Plug version: 0.10.0-1
Neovim version: 0.3.4-2

[junegunn]

This usually happens when you have a typo in a Plug argument. Make sure that you typed my handle correctly when you tested it.