Выдает ошибку statistics.statisticserror mean requires at least one data point

import statistics
 
 
def ReadData(Count):
 
  print('Enter Student parameters: gender (G/B (Upper case!)),  surname, height and weight. Use "space" to split data\nStrictly follow input order!\n')
 
  for _ in range(Count):
 
    rawData = input().split(' ')
 
  yield {'gender': rawData[0],'surname':rawData[1], 'height':int(rawData[2]), 'weight':int(rawData[3])}
 
def IsolateParameter(Container, Attribute):
 
    for LocCont in Container:
 
      yield LocCont[Attribute]
 
 
def StatAverage(Cont, Attribute, StatFunc):
 
  return StatFunc(list(IsolateParameter(Cont, Attribute)))
 
def GetTopHeight(Cont):
 
  return max(list(IsolateParameter(Cont, 'height')))
 
 
def main():
 
  RawData = ReadData(int(input('Count of Students:\n')))
 
  ListedData = list(RawData)
 
  AllBoys = filter(lambda g: g['gender'] == 'B', ListedData)
 
  AllGirls = filter(lambda g: g['gender'] == 'G', ListedData)
 
  AvBoyWeight = StatAverage(AllBoys, 'weight', statistics.mean)
 
  AvGirlsHeight = StatAverage(AllGirls, 'height', statistics.mean)
 
  TopHeightSurname = GetTopHeight(ListedData)
 
  print('''
 
  Average Boys weight: {0};
 
  Average Girls height: {1};
 
  Surname of tallest student: {2}
 
  '''.format(AvBoyWeight, AvGirlsHeight, TopHeightSurname))
 
if __name__ == '__main__':
 
  main()