Landscape is black when i add a material

Im new to unreal and was looking to apply/paint a texture onto my landscape. I was following a tutorial that I could understand (Texturing a Landscape in UE4 (Unreal Engine 4) - YouTube) however when I applied the material in the landscape details I got this:

Heres the the nodes behind it as well:

Hi there,

The most likely culprit causing the all black landscape is the missing layer info. So you have your material, which is looking for the layers you have set up, grass, rock, dirt. The issue is that by default the landscape won’t know what those layers are. You create the landscape layer info by going to the Landscape and then the Paint tab. Here you can press the (+) icon and create the layer info you want. Once that info exists and is reference, you can paint onto it. That Layer info is where any layer painting information is stored.

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You are a life saver man, this helped me !!
Thanks !!