Reading that may have helped a little, however i'm still facing the problem I mentioned above. Upon starting over a new project again, the very first thing I did was adding the references. I immediately ran into the said warnings again. Is there something i'm missing from this?
EDIT: I solved the problem! I clicked on the project's name in the Solution Explorer, then clicked on properties. Under the project's properties in the "Build" section, it's Platform Target was selected as "Any CPU". All I had to do was change it to x86, which was sensible to the warnings.
However another problem still exists, the UI elements still aren't showing up in the game. I took a look at the Example Mod's properties as well, and noticed the "Platform" Selection (Below image, beside "Configuration"). In the Example Mod, there's only one selection, and it's locked on "x86". Mine is locked on "Any CPU". Could this be the problem as to why the UI isn't showing in game?