White line across my blender sample render? A nasty white line runs horizontal across my sample render and I can't seem to find what's causing it! I'm using blender internal render. 



Blend File: http://www.filedropper.com/grass

Thank you! :)
Thanks to @Cegaton, the line is now gone! He suggested I resize my background image, as the line coincided with the bottom of the image. Now that I resized the image so that there are no edges within the camera view, the line is gone! Thank you Cegaton!!