XD Oh- Thanks so much!!!
Edit: Uh...
I looked at the error message, and copied a material file from one of the presets. I renamed it to tempTerrain.material and stuck it in a folder I made at FeralHearts>media>terrains called "temp." The first time I started the map maker, the material file fixed itself and put in the right code and two other files it needed. Go figure. /shrug
^I followed theise instructions I found^
And I HAVE a file named "tempTerrain.material" under a file called "temp" in FeralHeart>media>terrains O_O' And- It's still not working.... *facedesk*