PaddleOCR: RuntimeError: (PreconditionNotMet) Tensor not initialized yet when Tensor::type() is called.

2021-05-25 11:15:18,710 - ERROR - Exception on /ocr [POST]
Traceback (most recent call last):
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "e:\xxx\app.py", line 90, in paddle
    result = chineseOCREngine.ocr(image, cls=False)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\paddleocr\paddleocr.py", line 383, in ocr
    dt_boxes, rec_res = self.__call__(img)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\paddleocr\tools\infer\predict_system.py", line 109, in __call__
    rec_res, elapse = self.text_recognizer(img_crop_list)
  File "C:\Users\xxx\AppData\Local\Programs\Python\Python37\lib\site-packages\paddleocr\tools\infer\predict_rec.py", line 239, in __call__
    output = output_tensor.copy_to_cpu()
RuntimeError: (PreconditionNotMet) Tensor not initialized yet when Tensor::type() is called.
  [Hint: holder_ should not be null.] (at D:\v2.0.1\paddle\paddle/fluid/framework/tensor.h:202)