hi @FNBRVALOU
You have got corruption in a directory
In Windows
Type Windows key + R
In the box type “cmd”
Click ok, the windows batch console opens
cd %USERPROFILE%\AppData\Local\FortniteGame
del/s/q *.*
You are emptying corrupted copies of Fortnite code stored in you PC User path which is normally hidden from view
Probably best to run verify afterwards.