When I execute
image lookup -n “-[UIViewController viewDidLoad]”
I don’t get anything back like the example in the book. It doesn’t give an error it just returns nothing.
I thought that I must have been missing something. I looked through the chapters and didn’t notice anything. So I made sure the lldb running in the terminal was attached. Then some things worked others didn’t. Then I realized that I could try the Xcode debugger console. That’s an lldb instance. So everything worked after that. Well at least the “image lookup” did.
Thanks for sharing a follow up and welcome to the community @marvmax! If you’re still having trouble with any of the chapters don’t hesitate to reach out here. We’ll try our best to help you. 
Best,
Gina
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