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Chapter 2 - cannot find 'Observable' in scope

As you see the screenshot, I got error messages “cannot find ‘Observable’ in scope”.
I didi run bootstrap.sh, already.

What’s wrong? :’(

Thank you for your help and hint

I unfortunately have the same issue.

If you are using XCODE 12, make sure the ‘build active scheme’ checkbox on the right is checked. That fixed the problem for me.