If you got error that says "LowLevelFatalError" that originates from the D3D12Util.cpp file in the Unreal Engine. This error likely relates to DirectX 12 (D3D12), specifically a failure with the graphics adapter, which could point to several issues such as:

Graphics Driver Issues: Outdated or incompatible GPU drivers.
DirectX Corruption: Corrupt or missing DirectX components.
File Corruption: Certain system files related to DirectX or other components may have become corrupted.

DirectX 12 Issues: The Unreal Engine relies heavily on DirectX for rendering. If there's a problem with your DirectX installation or your graphics driver, the engine might fail to initialize correctly, leading to crashes like this.

System File Corruption: System files related to DirectX or graphics processing could be damaged, which affects the game's ability to launch.

1- Open the command in windows CMD in administrator mode (Required)
2- Type : DISM.exe /Online /Cleanup-image /Restorehealth , enter and wait.
3- Type : sfc /scannow , enter and wait, then close


The sfc /scannow command (System File Checker) is used to scan and repair corrupted system files. When the game encounters a DirectX error, it's possible that one or more critical system files or components related to the game, DirectX, or even Windows itself may have become corrupted.

SFC checks your system files against a protected backup and replaces any corrupted or missing files. If the root cause of the issue is a corrupted system file (such as a DirectX file), this command will repair it and potentially resolve the issue.