Vim: Error message on sourcing, but not on start up

I'm pretty new to Vim/gVim and am probably doing something wrong. What I want to do is completely reload my configuration (like a restart), but while gVim is running (keep the current session). Here are the steps I take and their result:

1. Start gVim → No error

2. :so $MYVIMRC → No error

3. :so $MYGVIMRC
   Error detected while processing ~.gvimrc:
   line    1:
   E185: Cannot find color scheme 'kolor'
   
   

When I do step 3 before step 2 I don't get any error, but what if I want to source the files multiple times in the same session? Do I have to unload them first somehow, or do I have to save the session, restart gVim and reload the session again each time?

---

~/.gvimrc:

set runtimepath=$HOME/.vim,$VIMRUNTIME,$HOME/.vim/after
execute pathogen#infect()

~/.gvimrc:

colorscheme kolor

~/.vim/autoload/pathogen.vim

~/.vim/bundle/vim-kolor/colors/kolor.vim

---

Vim 7.4, patches 1-2054
Windows & Xubuntu

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