Inaccessible boot device

I’ve been tearing my hair out trying to migrate from my 2008 Mac Pro using El Capitan to my 2017 MacBook Pro with High Sierra. After migrating using Winclone I get the error “Inaccessible Boot Device“. Any ideas why?

Hey Larry, I think I’m having a similar issue. I posted last week but haven’t gotten a response.

Windows 7 isn’t support on the new hardware: