Данные изображения dtype не могут быть преобразованы в float

Question

Вот мой код

      import numpy as np
import matplotlib.pyplot as plt
import os
import cv2

      directory = "./img/"

classes = ["guns"]

      for i in classes:
    path = os.path.join(directory,i)  # create path to dogs and cats
    for img in os.listdir("C:/Users/Asus/.conda/envs/tensorflowp36/DL-CV-TF-Keras_Resources/5-Creating_datasets/img/guns"):
        if img.endswith((".png", ".jpg", ".jpeg")):
            img_array = cv2.imread(os.path.join(path,img) ,cv2.IMREAD_GRAYSCALE)
            plt.imshow(img_array) 
            #plt.show()

        break
    break 

Я получаю результат

      
**TypeError                                 Traceback (most recent call last)**
**<ipython-input-62-0bf420b2bd1a> in <module>**
      4         if img.endswith((".png", ".jpg", ".jpeg")):
      5             img_array = cv2.imread(os.path.join(path,img) ,cv2.IMREAD_GRAYSCALE)
----> 6             plt.imshow(img_array)
      7             #plt.show()
      8 
**~\AppData\Roaming\Python\Python36\site-packages\matplotlib\pyplot.py in imshow(X, cmap, norm, aspect, interpolation, alpha, vmin, vmax, origin, extent, filternorm, filterrad, resample, url, data,** ****kwargs)**
   2728         filternorm=filternorm, filterrad=filterrad, resample=resample,
   2729         url=url, **({"data": data} if data is not None else {}),
-> 2730         **kwargs)
   2731     sci(__ret)
   2732     return __ret
**~\AppData\Roaming\Python\Python36\site-packages\matplotlib\__init__.py in inner(ax, data,** ***args,** ****kwargs)**
   1436     def inner(ax, *args, data=None, **kwargs):
   1437         if data is None:
-> 1438             return func(ax, *map(sanitize_sequence, args), **kwargs)
   1439 
   1440         bound = new_sig.bind(ax, *args, **kwargs)
**~\AppData\Roaming\Python\Python36\site-packages\matplotlib\axes\_axes.py in imshow(self, X, cmap, norm, aspect, interpolation, alpha, vmin, vmax, origin, extent, filternorm, filterrad, resample, url,** ****kwargs)**
   5521                               resample=resample, **kwargs)
   5522 
-> 5523         im.set_data(X)
   5524         im.set_alpha(alpha)
   5525         if im.get_clip_path() is None:
**~\AppData\Roaming\Python\Python36\site-packages\matplotlib\image.py in set_data(self, A)**
    699                 not np.can_cast(self._A.dtype, float, "same_kind")):
    700             raise TypeError("Image data of dtype {} cannot be converted to "
--> 701                             "float".format(self._A.dtype))
    702 
    703         if self._A.ndim == 3 and self._A.shape[-1] == 1:
**TypeError: Image data of dtype object cannot be converted to float**

Что я делаю неправильно?