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Based on what you get as answers, I'd assume that:

1. You haven't set a bus subsystem, that's why you get error '2' from your first print.
2. The machines are modelled as regular machines instead of induction machines, as when you try to list all of them, you get none.

Solution: I'd assume that the inertia constants are inside the .dyr-file instead of the .sav case. Since amachreal doesn't allow intertia as the search string, I'm not sure if you can access that data directly from PSS/E, but you could iterate through the .dyr text file to find the inertias?