errors, crashes, i fixed all the errors and crashes when i finished all of this a crash said " Assertion failed: GRHIVendorId != 0 " i searched about that and i found that Epic games said that this crash is an issue of the epic games company, sry for my low english, please fix it you said that you will fix it in 2015 
– Assertion failed: GRHIVendorId != 0 –