error in tool help

[[files]Tomster9472]

i used bitmaps source directory then it said...

###mapname_ground.tif

skipping bitmaps with non-power-of-two dimensions <#516x#516#>

can someone tell me what i did wrong with my image?

[CHewy Gumball]

It means exactly what it says, It won't compile your bitmap because it doesn't have dimensions of powers of two. 516 is not a power of two, 512 is though.