getting started: can't load project file: 'solution load command failed (-1)'

[Ray]

Hello.  I'm just trying to get going with the nRF9160 DK which just arrived.

Using macOS.

Followed Getting Started and then nRF Connect Getting Started Assistant, and everything was going quite well.

However, when I got to the point of Open nRF Connect SDK Project, regardless of whether I try it with the asset_tracker or the secure_boot, immediately after filling out the paths in that initial dialog, I get "Can't load project file" / "The project file '/Users/rozzie/dev/nrf/ncs/nrf/samples/nrf9160/secure_boot/build/secure_boot.emProject' is invalid.

The reported error is 'solution load command failed (-1)'

I've verified all the paths, etc., and all seems fine.

Screen shot below.

Any ideas how to move forward?

Thanks.

[Nobel Kuo]

Sorry. I mean the problem is possibly caused by skipping these steps. Because I missed the pip3 steps, and appeared the same error message.