The output landscape is black with my material applied

I am very new to Unreal Engine. I have just finished a very simple material ( i followed a tutorial), but when i dragged and dropped it into the landscape materials tab, my entire landscape went black. completely black. I then tried again with some starter content materials and they worked just fine. After doing some quick research, i found other similar cases, but as i am a beginner, I didn’t understand the advice given. please help!

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