Fortnite crashes or open the game in Full Blackscreen

If i trying to start fortnite trough the Epicgameslauncher the game pops up in a blackscreen and crashes then, or a fulltime blackscreen appears and wont show the game. If the game crashes, there it showes an unrealengine error-

Hello, thank you for reporting your issues with Fortnite. However, Answerhub is meant for issues relating directly to Unreal Engine 4 rather than our game titles. For assistance with Fortnite, please visit the following link:

http://fortnitehelp.epicgames.com/

If you cannot find the solution to the problem you’re encountering, please use the Email Us link on that page to contact Player Support for further assistance. Although the error mentions Unreal Engine, that is just because that is the engine Fortnite is made with. The issue is still with Fortnite itself.