We need more information; a screenshot is very limited information for such a huge topic. What seems to be the problem, and what have you tried to do in order to solve it?
I opened a new architecture project and added procedural biomes (the one that is free for the month in the marketplace) and when I open it the landscape material is completely black, the plants, grass and trees are visible but the ground material is It looks black and when I try to edit it it looks like in the screenshot and I tried to change the sample nodes to wrapped but all the textures are already like this.