Missing Private Key Woes

[Dan Friedman]

I am reaching out for some assistance while I have 1 hair left in my head!   Can't build standalone for iOS in LC... get this message:  "There was an error while saving the standalone application - could not find a valid identity to use for the selected profile."

I look in XCode > Preferences > Accounts and I see the Signing certificate says "Missing Private Key".   Is this the issue?  Does anyone have any advice on this?

With much gratitude,
-Dan