@mr0berts. Thanks for posting. This is a Joomla generated error. It means that the folder that was supplied doesn’t exist. So, as it goes through to look for files you get the other two warnings. This could be because you either entered the wrong file path, or that your WYSIWYG editor is messing with the quotes and adding hidden characters. When you go to your article make sure to toggle the editor, and post a screenshot of it here.
Let me know.