How do i fix assets all showing up pink?

When I try to open a project file that my course instructor provided me all the assets come out Pink. I how do I fix this?
There is also error message that pops up at the bottom of the screen. Someone please help!

When something is displayed in pink, it means that there is no material and/or shader being used, and Unity defaults to a pink error shader. The solution would be to find the offending assets, and applying the correct material / shader.