In response to the suggestion by Shen88 to "Restore Defaults:"
I have tried this twice, just did so again, and it has not shown vmnet0.
It takes many minutes to complete "installing network adapters." Is that reasonable?
It only shows vmnet1 and vmnet8 configured as shown in the screen shot.
When I try to add VMnet0 as "Bridged," it gives the same error shown in the screen shot.
If I leave it as "Host-only" and then try to add it, it takes many minutes to complete on "Updating VMnet0: Install host virtual adapter." I wonder if this indicates a problem.