Log out of App Store, restart, then log back in.
Unfortunately, even on beta 3, the App Store still isn’t perfect.
Yeah I tried that first, then tried a hard reset and it came back with the black screen connect to iTunes and said I had to do a full restore. So I decided to download the ipsw for iOS 11 beta 3 and tried an update with it, no go, so did a full restore from the ipsw so I could use my iCloud backup from 11.
First time I ever had a crash like that on a beta, but it happens, and going with the ipsw file was much faster then restoring back to 10 then back to 11.