Hi Justin,

place the states.remove() on a new line

if you are trying to remove the nested list, then you'll need to quote the entire list i.e. ['red', 'green', 'blue']

I find I am able to figure these challenges out more easily when I write the code locally on my machine in IDLE and execute the module from there. That way you get the direct error feedback from Python. e.g. when I execute your code above I get syntax error from Python. Any little clue helps!

[MOD: changed from comment to answer - srh]