You likely don't want to load 18.7.1 for Fortnite. Many have issue with it. Just ignore the message and the game should load unless you already updated. In that case load the last driver that worked for you. Search Fortnite in this forum this topic is already being beat to death.
You gave no system information but it looks like you are running Windows 10 64bit.
I get the same message in Fortnite.
Just click ok and run the game with 18.7.1.