Get warning message and Litchi won't let me fly

Warning, Flight simulator closed, please restart aircraft.

Why am I getting this? Please and thank you.


What model drone?
Which version of Litchi? (IOS or Android)
What device is Litchi running on?

More info is needed to help, Skip

I saw my Mavic 2 Pro grounded in a similar inexplicable fashion recently and it turned out to be a defective SD card of all things.