.dif's unable to load in Torque

Using QuArK 6.3 and map2dif.exe that came with Torque SDK.

Console output on attempting to load the interior:

MissionAreaEditor::onWake: no TerrainBlock object.
Could not locate texture: fps/data/terrains/grassland/grass
Could not locate texture: fps/data/terrains/grassland/grass
Could not locate texture: fps/data/terrains/grassland/grass
Could not locate texture: fps/data/terrains/grassland/grass
Could not locate texture: fps/data/terrains/grassland/grass
Could not locate texture: fps/data/terrains/grassland/grass
Unable to read detail level 0 in interior resource
Unable to load interior: fps/data/interiors/ctf/testmap.dif
common/editor/EditorGui.cs (1191): Register object failed for object (null).


We can eliminate the texture errors as I've fixed that. It's the Unable messages that have me a tad bit stumped here. It's a simple map; QuArK's default map with a few textures and omni-lighting.

I've also tried making a few things, say a room with another object within, and a pillar as well, yet I always get this message when attempting to load the interior files into the mission editor. Any ideas/help?