From the image I was trying to generate a building using a plane for this tutorial series I am following. Now my problem is with the empty object once I add it and set the Array to Object Offset I rotate it to 90 degrees on the x axis (as its the horizontal axis ) but look at it it segments into smaller pieces and refuses to at least look like they are joined. I am stumped.
Move the top array modifier underneath the one under it. It will solve the problem.
Edit: Select your building, go to Object > Set Origin > Origin to Geometry. Then select the empty, then select the building and press Shift + Z > Selection to active. Now go into front view mode, select your empty, and scale on the Z-axis after zooming into the top and press the Shift key so you can do it accurately. Your building will now be even. I do not know why did you use an empty as an object offset, the better solution would be disabling object offset, but if you want it this is a temporary solution.
Edit 2: Ignore everything I mentioned above. Just follow the video setup, select your object (the building base mesh) and press Ctrl+A>Apply Scale. Your building will now be the same height, and it would be exactly like the tutorial.