error in run train.py

[wangkepermit]

---------below is my command and output--------

root@wangke-S2400SC:~/chainer-fast-neuralstyle# python train.py --style_image ./style.jpg --dataset ./train2014 --output ./models/my
num traning images: 40458
40458 iterations, 2 epochs
epoch 0
Traceback (most recent call last):
File "train.py", line 118, in
x[j] = load_image(imagepaths[i*batchsize + j], image_size)
File "train.py", line 22, in load_image
return xp.asarray(image, dtype=np.float32).transpose(2, 0, 1)
File "/usr/local/lib/python2.7/dist-packages/numpy/core/numeric.py", line 531, in asarray
return array(a, dtype, copy=False, order=order)
File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 528, in getattr
raise AttributeError(name)
AttributeError: float