"No response received from web browser."
"$expect is not defined"
This happen in all the exercises, even when I know I am writing the correct thing. I mean, some exercises only ask to change a value of 20px to 2em and so.
I am using Mozilla Firefox running on Win 7 64bits.
I made HTML & CSS course before and had no problem at all. This is becoming really frustrating because I can't continue to the next exercise without clicking the "Get Code" button.
Edit: Media Query Lesson seems to not have this issue.