caccia errore

def contaPix(l,k):
#@ param l : sequence of pixel
#@ param k: int
#@ return int
  p = 0
  for i in range(0, len(l)):
    count = 0
    lum1 = lum(l[i])
    for j in range (0, len(l)):
      if i != j:
        lum2 = lum(l[j])
        if lum1 == lum2:
          count = count+1
    if count == k:
      p=p+1

  return p

def lum(p):
#@ param p : pixel
#@ return int
  return (getRed(p)+getGreen(p)+getBlue(p))/3