I'll "Illegal terrain size" YOU!

I opened "Total Terrain" and clicked "New -> 64x64" and made it on that.....then saved the heightmap as "heightmap.bmp" and loaded it into Blitz with this:

;TERRAIN
map = LoadTerrain("level\heightmap.bmp")
color = LoadTexture("level\colormap.bmp")
terrain = CreateTerrain(map)
EntityTexture map, color