"error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'" Code Answer's

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error: (-215:Assertion failed) !_src.empty() in function 'cv::cvtColor'

By Curious CodCurious Cod on Mar 09, 2020 
This error happened because the image didn't load properly.
So you have problem with the previous line cv2.imread my suggestion is :

check if the images exist in the path you give

check the count variable if he have valid number

Source: stackoverflow.com

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error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

By Dizzy DormouseDizzy Dormouse on Apr 29, 2021 
face_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_eye.xml')

Source: stackoverflow.com

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error: (-215:assertion failed) !empty() in function 'cv::cascadeclassifier::detectmultiscale'

By Brave BearBrave Bear on Jun 08, 2021 
cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_fullbody.xml')
cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_frontalface_default.xml')
cv2.CascadeClassifier(cv2.data.haarcascades + 'haarcascade_eye.xml')

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\cascadedetect.cpp:1689: error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale'

By Thoughtful TernThoughtful Tern on Jun 16, 2021 
face_cascade.load('haarcascade_frontalface_default.xml')

Source: answers.opencv.org

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error: (-215:Assertion failed) !empty() in function 'cv::CascadeClassifier::detectMultiScale' cv2.error: OpenCV(4.3.0) /io/opencv/modules/imgproc/src/drawing.cpp:2374: error: (-215:Assertion failed) p.checkVector(2, CV_32S) >= 0 in function 'fillPoly' difference between hard assertion and soft assertion ERROR Error: ASSERTION ERROR: Stored value should never be NO_CHANGE. Error: Assertion failed: org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/navigation/history.dart:284:14 _userProvidedRouteName != null is not true Failed assertion: line 1861 pos 16: 'constraints.hasBoundedHeight': is not true. Failed assertion: 'constraints.hasBoundedWidth': is not true. failed to solve with frontend dockerfile.v0: failed to read dockerfile: failed to create lease: write /var/lib/docker/buildkit/containerdmeta.db: read-only file system Message could not be sent. 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