Coreerrorsopen Failed Mortal Kombat New - Null

Delete temporary configs – Navigate to %LocalAppData%\MK12\Saved\Config\Windows (or similar) and delete the GameUserSettings.ini file, then relaunch.

Ensure the save folder is not read-only – Right-click the game’s save folder (usually in Documents/My Games/MortalKombat) → Properties → Uncheck Read-only → Apply.

If you see an error like null coreerrorsopen failed when launching or running Mortal Kombat (or a similarly named "Mortal Kombat New" build/mod), try the steps below in order. These are concise, practical fixes that address common causes.

Before diving into complex technical fixes, ensure you have ruled out the simplest causes. null coreerrorsopen failed mortal kombat new

If you are playing the newest entry, MK1, there is a specific quirk regarding Intel 13th and 14th Gen Processors. If you see an error like null coreerrorsopen

There have been reports of instability on high-end Intel CPUs due to voltage issues (often called the "Intel Instability" issue). While this usually causes crashes during gameplay, it can sometimes prevent the core engine from initializing correctly at startup. null coreerrorsopen failed mortal kombat new