In tutorial, when someone debug app they see something like this:
But when i start recording, by pressing red button:
I see this...
I had 2 different versions of Xcode 9.4.1 and 10.1 both of them had command line tools which were in conflict(i suppose). To fix this issue I set right command line tools version there:
"Xcode -> Preferences -> Locations tab -> Command line tools".
Also check Build Settings and set "DWARF with dSYM File" to your target.