Marmalade SDK: Exception: Multiply Overflow

I was performing some transformations (scaling) on 2D sprites like this:

CIwMat2D matrix;
rot.Scale(IW_FIXED(2));

When I ran the app I received the following exception:

IwAssert failure (GEOM, 350). Message: Multiply overflow

The avoid this exception, you must set your matrix to the Identity matrix before applying transformations on it like this:

CIwMat2D matrix;
matrix.SetIdentity();
rot.Scale(IW_FIXED(2));