Terrain Crashing Game

[Sandfury]

So I made about two map terrains so far so I could make a new map. The first one I deleted since I gave up, and the second one I just made.
When I tried to load it, (Typed in the file name) the game crashes.

Here's what I tried.
*Made a Map and put the PNG file into the folder 11 (Map name so I could easily access it, and I had the file in FH>media>terrains)
*Changed the name
*Made the map HUGE before typing in the file
*Blurred the photo
*Put it back into FH>media>terrians
*Made the map huge again
I use Paint.NET for drawing and map making. There's an adjustment to make the picture B/W, too.
The picture is 513x513 (Like it probably should be.)
It is a .PNG file.
I had renamed the file from WIP>Woof (Idk why), so there's no special characters in it.
The first time I didn't have any problems. (For my first map I made a month or two ago) So, is there anything I am doing wrong this time?

-Sandfury

[SnappleApple]

Well, it says you made the map huge. You should try making it smaller. If it doesn't work, try saving the Height map and Terrain masks in a different folder, (Preferably desktop) and make a new map with them. Also, make sure the Height map is in grayscale.
~Snapple

[Ingredient]

You need to make a greyscale type image for the heightmap to work, Paint.net doesn't have this option which may be why your map crashes the game. I'd suggest using a program such as GIMP and trying again.

http://www.gimp.org/

[Sandfury]

Well, it says you made the map huge. You should try making it smaller. If it doesn't work, try saving the Height map and Terrain masks in a different folder, (Preferably desktop) and make a new map with them. Also, make sure the Height map is in grayscale.
~Snapple

I left it at the default size, and it still crashed.
Put them in a different spot, and it said "Cannot find Woof.PNG!"
Greyscale didn't matter in my first height-map, as I had used exact colors. (120 R 120 B 120 G)

You need to make a greyscale type image for the heightmap to work, Paint.net doesn't have this option which may be why your map crashes the game. I'd suggest using a program such as GIMP and trying again.

http://www.gimp.org/

As said in the previous reply, I don't really understand how my first map worked, but my new one did not. But I will try and download GIMP.
-Sandfury