Hi Everybody, I just started learning Unreal Engine 4. And I was following a Udemy course on Unreal Engine 4. I was working on a game and then saved my project and closed it. When I came back to it 2 days later, I found my landscape textures were gone and were replaced with a black and grey checkered texture. I would appreciate any solution. Thanks in advance! 
Hey,
How many texture samples are you using in your landscape material? The maximum is 16 (minus a couple reserved by the engine). If you want to use more set the TextureSample node to Shared: Wrapped.
Otherwise, check that in Landscape Paint mode you still have your Layers assigned correctly?