Issue in Shadows

Hey guys, I was in the Shadows chapter and came across this issue:
I have passed the tests of shadows acne...n have updated the ShadeHit function with IsShadowed...But for some reason the walls, and floor are still having the acne problem. Here is the code for IsShadowed:
bool IsShadowed(World w, Entity point) {

// Vector from point to light source

Entity v = Subtract(w.light.position, point);



// Magnitude of that vector and it's direction

float distance = Magnitude(v);

Entity direction = Normalize(v);



// Create a ray from the point to the light source

Ray r(point, direction);



// Get list of intersections in the path of the ray

std::vector<Intersection> intersections = IntersectWorld(w, r);



Intersection h = Hit(intersections);

if (h.t != INFINITY && h.t < distance)

    return true;

else

    return false;

}

Could anyone please help me with this