Hey there @Drakgoku! Looks like you overwhelmed your GPU with that landscape. We can likely lower the overhead first by swapping down to DX11, then trying it again. Here’s also a thread that can help you get around these errors if you come across them, as well as showing you how to change the RHI.
Once you create the landscape under DX11 you can go back up to DX12 and it should be fine. Frequently it costs exponentially more to create it than it is to run the landscape itself.
