It means its unable to load the heightmap for some reason.
1. The command was not executed to load the heightmap.
2. The path to the heightmap is incorrect.
3. The heightmap is not a power of 2.
It was a few years back when i was messing with AT but i'm
90% sure it's a heightmap problem.
Since then i lost everything, including a list of all the AT errors so i havn't been updating DBP for a long time.
Been thinking of getting back into it when i have some time.
I am past the denial and have entered the acceptance stage.
Running on my memories for now.
p.s
Always allow yourself 10% for humility sake.
AMD 2600+/1GB ram/GeForce 6600oc 256MB/W2KPro/DBPro 6.6.b