newbie and mold

[gutshot]

I am new to the forum and I have read most of the stuff I was supposed to read before posting .
Forgive me I am new and trying to start a new hobby, I have a powdery white mold on top of my mash.
My mash consists of malted corn and cracked corn that I malted and cracked .
It has been 4 days now and smells somethin awful and sour .
Will i have to dump my mash?