ZeroNova

Hello I want to place a pre-made maze/ dungeon on my minehut server. The server has already been played on so a new server is not an option i want it on the server that we play on. So i was looking at some videos and came across the Structure Block. Wich is perfect for what i want to do. But the problem is that when i place the structure block and want to load a file it says "structure"name" is not available". I put the nbt file in every map thinkable. Can someone help me?