Syntax error on Popup module breaks furthering tutorial

[milesperhour1086]

Using Google Chrome, I reached the Popup module part of the tutorial without error. I completed the first part where google.com was opened properly. However, I made a small typo on the second part where I'm supposed to create the to-do list.

I accidentally typed in the following (notice 'list.do') and when I added the second 'end', I got a syntax error:
Popup.make do
h1 "Things To Do"
list.do
p "Try out Ruby"
p "Ride a tiger"
p "(down River Euphrates)"
end
end

However, when I tried to re-enter the code above, I continued to get the syntax error when after I had changed 'list.do' to 'list do' as the tutorial suggested.