Additionally, when I tried to report this issue at https://lolg.it/amber/amber-website/issues, I was unable to create a lolg.it account because no email address confirmation email was ever received, despite pressing "Click here to resent your activation email" several times.
I guess I will not be learning SmallTalk today.
Acutally, it's not. :-)
I understand the error message is not very helpful, but you did not
follow the instructions. The first lesson of Prof Stef explicitly asks
you to _select_ one specific text first, and _only then_ click "Do It".
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