Issue with Boolean Modifier

Hi, I’m trying to create the doorway with the boolean modifier, but it seems to not be working. If I make the cylinder the boolean object, I get this:

If I apply the boolean, it doesn’t work either. The hole is not there:

What might be the issue?

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It looks like you have two CUBES on the same spot.
The Building.wall and building.doorway

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As FedPete says it looks like you have a duplicate geometry problem on the cube wall.

Alternatively, that hashing effect is a result of the boolean half working.
Booleans are temperamental!
Try the 'Fast calculation it often works when the exact does not.
If that fails then change the position of the cutter cylinder a tiny fraction, it can make all the difference, especially if you have an exact line up of a cylinder edge and the cube base edge.

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Thanks! it was indeed just a duplicate of the wall on the same spot

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