Hey Christy,
The validator is complaining about what it thinks is an HTML entity. The short of it is, anywhere you have an ampersand (&) within your code, you need to replace that with &
The long answer is that glyphs that are not in the standard character set are represented by html entities, which allow a non-standard character glyph to be represented in an HTML document. You can read more information and see the representation for other html entities here:
http://www.w3schools.com/tags/ref_entities.asp
Good luck!