TypeError: Expected Ptr<cv::UMat> for argument 'src'

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This is my code :

import os
from PIL import Image
import numpy as np
import cv2
import pickle

Base_Dir = os.path.dirname(os.path.abspath("__file__"))
image_dir = os.path.join(Base_Dir, "Images")
face_cascade = cv2.CascadeClassifier('Cascades/haarcascade_frontalface_default.xml')
recoganiser = cv2.face.LBPHFaceRecognizer_create()

current_ID = 0
label_IDS = {}
y_lebels = []
x_train = []

for root, dirs, files in os.walk(image_dir):

    for file in files:
        if(file.endswith("png") or file.endswith("jpg") or file.endswith("JPG")):
            path = os.path.join(root, file)
            label = os.path.basename(os.path.dirname(path)).replace(" ","_").lower()
            # print(label)
            # print(path)
            if not label in label_IDS:
                label_IDS[label]= current_ID
                current_ID+=1



            id_ = label_IDS[label]
            x_train.append(path) #Verify the image and convert into gray and numpy array
            y_lebels.append(label) # some number for our labels

            pil_image = Image.open(path).convert('L')
            size = (600,600)
            final_image = pil_image.resize(size, Image.ANTIALIAS)
            image_array = np.array(pil_image, 'uint8')
            faces = face_cascade.detectMultiScale(image_array, 2, 7)
            for(x, y, w, h) in faces:
                roi = image_array[y:y+h, x:x+w]
                x_train.append(roi)
                y_lebels.append(id_)
with open("lebels.pickle", "wb") as f:

    pickle.dump(label_IDS, f)

recoganiser.train(x_train, np.array(y_lebels))
recoganiser.save("trainer.yml")

And this is my error , what to do ?

TypeError                                 Traceback (most recent call last)
<ipython-input-12-34c1b618384f> in <module>
     52         pickle.dump(label_IDS, f)
     53 
---> 54 recoganiser.train(x_train, np.array(y_lebels))
     55 recoganiser.save("trainer.yml")

TypeError: Expected Ptr<cv::UMat> for argument 'src'