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UE5: Landscape Physical Material needs to be rebuilt

Hi,
I have an issue with UE5. It’s pretty widespread, but I found nowhere a solution. When I start my UE5 project in the window I have a notification in the top left corner that sais: “Landscape Physical Material needs to be rebuilt (64)”. When I try to build it nothing happens. Has anyone a solution? If I close the project and restart it will not start again and crashes, so I have to get it from a backup back.