my function doesn't seem to be spotted by the software. THe error just says "where's 'word_count()'?

# E.g. word_count("I am that I am") gets back a dictionary like:
# {'i': 2, 'am': 2, 'that': 1}
# Lowercase the string to make it easier.
# Using .split() on the sentence will give you a list of words.
# In a for loop of that list, you'll have a word that you can
# check for inclusion in the dict (with "if word in dict"-style syntax).
# Or add it to the dict with something like word_dict[word] = 1.
def word_count(words):
  occurences = {}
  word_list = words.lower().split(" ")
  for word in wordlist:
    if word in occurences:
      occurences[word] += 1
    else:
      occurences[word] = 1
  return occurences