Ok so easiest way to fix this is to copy and paste the exact https://fonts.googleapis.com/css?family=Roboto:100 from the lesson into your code and then double quote it. that took care of your problem when I copy your code and put it into my lesson browser.
It may have been just your line of code for fonts was just slightly off due to not having double quotes or not copying it over exactly. But yes that is supposed to happen because it wants you to do it exactly.