Why do I get ESP-RHI-01 error code when launching Fortnite or Save The World?

This error message can indicate that a file in the Epic Games folder is corrupted. Deleting these folders and then launching the game again should fix the error. The folder and files inside are recreated when the game is launched again.

1. Close the Epic Games Launcher:
   1. In the lower right corner, click on the chevron icon (the arrow pointing up)
   2. Right-click on the Epic icon in the pop-up window
   3. Select Exit
2. Delete the following Epic Games folders:
   1. Press Windows Key + R to open the Run window.
   2. Type %localappdata% and press Enter
   3. Right-click on the EpicGamesLauncher folder and select Delete
   4. Right-click on the FortniteGame folder and select Delete
   5. Try launching Fortnite again