错误信息如下所示，感觉是代码没有问题啊。

主要就一是载入模型，二是进行预测，结果就错了找不到原因

import paddlex as pdx
import imageio
import os
import matplotlib.pyplot as plt
%matplotlib inline
%cd ~

model = pdx.load_model('output/mobilenetv3_small_ssld/best_model')
image_name = r'~/dataset/images/Images/n02085620-Chihuahua/n02085620_10074.jpg'
if not os.access(image_name, os.F_OK):
                print("file has not exist!")
                print(image_name)
im = imageio.imread(image_name)
plt.imshow(im)
plt.show()
result = model.predict(image_name)
print("Predict Result:", result)

---------------------------------------------------------------------------AttributeError                            Traceback (most recent call last) in 
     14 plt.imshow(im)
     15 plt.show()
---> 16 result = model.predict(image_name)
     17 print("Predict Result:", result)
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlex/cv/models/classifier.py in predict(self, img_file, transforms, topk)
    353             self.model_type,
    354             self.__class__.__name__,
--> 355             input_channel=input_channel)
    356 
    357         with fluid.scope_guard(self.scope):
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlex/cv/models/classifier.py in _preprocess(images, transforms, model_type, class_name, thread_pool, input_channel)
    307             batch_data = list()
    308             for image in images:
--> 309                 batch_data.append(transforms(image))
    310         padding_batch = generate_minibatch(batch_data)
    311         im = np.array([data[0] for data in padding_batch])
/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlex/cv/transforms/cls_transforms.py in __call__(self, im_file, label)
     88                 raise TypeError('Can\'t read The image file {}!'.format(
     89                     im_file))
---> 90         self.data_type = im.dtype
     91         im = im.astype('float32')
     92         if input_channel == 3 and self.to_rgb:
AttributeError: 'NoneType' object has no attribute 'dtype'