Imported landscape layers problems

Hello.
I’m following the tutorial:
When I create a material for my landcape and add layers info for each created layer my landscape is whole red but in tutorial every layer is shown as it should be. I tried to right click on one of the layers and clik “fill” but it didn’t help. I need to add that preview weights for all layers are set up to value > 0 . Is there anything I should do in UE4.19 or 4.18 to fill the layers properly as shown in the tutorial movie ?

I attach my red landscape and my material set up with blent tyle “LB height blend” for material layers.

Ok. The solution is to forget about the tutorial mentioned in the post above and use another more complex one but fine working. For those beginners who needs any roadmap haw to do effective landscapes here is the link: World Machine to Unreal Engine 4 Part 3 (Setting up Materials and Lighting) - YouTube