mat打不开,报错zlib.error: Error -3 while decompressing data: invalid literal/length code？请帮帮忙，谢谢

import scipy.io as scio

dataFile = './mnist.mat'

data = scio.loadmat(dataFile)

报错

  File "mio5_utils.pyx", line 675, in scipy.io.matlab.mio5_utils.VarReader5.array_from_header
  File "mio5_utils.pyx", line 705, in scipy.io.matlab.mio5_utils.VarReader5.array_from_header
  File "mio5_utils.pyx", line 778, in scipy.io.matlab.mio5_utils.VarReader5.read_real_complex
  File "mio5_utils.pyx", line 450, in scipy.io.matlab.mio5_utils.VarReader5.read_numeric
  File "mio5_utils.pyx", line 355, in scipy.io.matlab.mio5_utils.VarReader5.read_element
  File "streams.pyx", line 195, in scipy.io.matlab.streams.ZlibInputStream.read_string
  File "streams.pyx", line 171, in scipy.io.matlab.streams.ZlibInputStream.read_into
  File "streams.pyx", line 158, in scipy.io.matlab.streams.ZlibInputStream._fill_buffer
zlib.error: Error -3 while decompressing data: invalid literal/length code