Try verifying your engine build. To do so, go to the Launcher>library>engine version dropdown context menu>verify. This will check to see if any of your engine files are damaged or missing and repair/replace them if they are.
Try verifying your engine build. To do so, go to the Launcher>library>engine version dropdown context menu>verify. This will check to see if any of your engine files are damaged or missing and repair/replace them if they are.