Low poly hill help

Hello I am very new to blender and I finally made a low poly hill


But when i put it in a mesh part in studios it look like this
anyone know how to fix this?

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This question has been asked a lot, try searching your question before you post. This post should answer your question. Mesh Face/Normal Orientation Blender 2.8

Just flip your normals, you can use this video for help! But yes, this question has been asked before.

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Hi, just go onto blender and go to modifiers, then press the Solidify modifier! :smiley: