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I'm using opencv native code(.cpp) in android studio to detect rectangle corners
Error message:
E/cv::error(): OpenCV Error: Assertion failed (count >= 0 && (depth == 5 || depth == 4)) in double cv::arcLength(cv::InputArray, bool), file E:\build\opencv-3.3.1\modules\imgproc\src\shapedescr.cpp, line 284

Error occurs in this line : cv::approxPolyDP(cv::Mat(corners), approx, cv::arcLength(cv::Mat(corners), true) * 0.02, true);

It show not a quadrilateral

due to the line:
face_cascade.detectMultiScale(im,faces, 1.1, 2,0|CV_HAAR_SCALE_IMAGE,cv::Size(30,30));

i get an error stating:

Windows has triggered a breakpoint in eye.exe.

This may be due to a corruption of the heap, which indicates a bug in eye.exe or any of the DLLs it has loaded.

This may also be due to the user pressing F12 while eye.exe has focus.

The output window may have more diagnostic information.

without this line the code works with capturing the frame...without any detections..
please help...