Can't paint foliage on an imported landscape

Am I spose to edit anything when I had a 4096x4096 Heightmap to get 4033x4033 size’s

If I load a 4033x4033 map
https://www.dropbox/s/j267jyx14r3hwtq/Screenshot%202015-07-11%2011.32.37.png?dl=0

If I load a 4096x4096 map
https://www.dropbox/s/f3bhhi9cl54tvdd/Screenshot%202015-07-11%2011.32.53.png?dl=0

Sorry but I’m not sure why I’m now getting the error:

/HeightMaps/Annwyn_Weight_01_Rock.raw’s filesize does not match with current Landscape extent

Am I to assume I need to make sure the weightmap .raw file have to be the Overall Resolution size?