!empty() in function 'cv::CascadeClassifier::detectMultiScale'

[AntonSax]

I'm continually receiving this error message upon running the command.

beginning FaceImage run for image path: Selfie_a_Day_Project_January_2019\20190131_210126.jpg
Starting Selfie_a_Day_Project_January_2019\20190131_210126.jpg
No eyes found, falling back on face

*** Incomplete: Selfie_a_Day_Project_January_2019\20190131_210126.jpg ***
Traceback (most recent call last):
File "C:\Users\Tony\Documents\Projects\facealign\src\FaceImage.py", line 343, in runFaceImage
fi.cropToFace()
File "C:\Users\Tony\Documents\Projects\facealign\src\FaceImage.py", line 117, in cropToFace
face = self._getFace()
File "C:\Users\Tony\Documents\Projects\facealign\src\FaceImage.py", line 257, in _getFace
faces = toRects(cascade.detectMultiScale(self.image))
cv2.error: OpenCV(4.1.2) C:\projects\opencv-python\opencv\modules\objdetect\src\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'