I have recently had to reinstall fortnite do to a launch issue, in which I had to re-verify the files and re-download them. I came across this error code when I did so. I have completely deleted and reinstalled the game, run a windows memory diagnostic (no errors found) and have yet to try a clean boot. I cannot find any other advice or assistance this other than those methods, if anyone has any advice for this, it would be greatly appreciated!