I'm having trouble with calcOpticalFlowPyrLK. Sometimes it returns an error, sometimes it doesn't. I've double-checked the input data, and it seems to be correct.

Please help me, thank you.

cv.calcOpticalFlowPyrLK(
    preGray,
    curGray,
    p0,
    p1,
    st,
    err,
    winSize,
    maxLevel,
    criteria,
  );

  cv.exceptionFromPtr(err);

error