"Cannot read property 'testWeb' of undefined"


I'm at 4. The .css file.

I have a message at the bottom of the Editor that says: 'Cannot read property 'testWeb' of undefined'. I have no idea what this means and there is no 'testWeb' in the Editor.
What is it asking me to do?

Replace this line with your code.


can you be more clearer? i'm also having this problem......please


I also get this error but can not figure out why!


Just click many times on button "Run" and the problem will disappear. I also had this problem.


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