ret, corners = cv2.findChessboardCorners(_Image, size, cv2.CALIB_CB_ADAPTIVE_THRESH+cv2.CALIB_CB_FAST_CHECK+cv2.CALIB_CB_NORMALIZE_IMAGE)
TypeError: corners is not a numpy array, neither a scalar

size = (10,6)
_Image = cv2.imread(filePath, 0)
ret, corners = cv2.findChessboardCorners(_Image, size, cv2.CALIB_CB_ADAPTIVE_THRESH+cv2.CALIB_CB_FAST_CHECK+cv2.CALIB_CB_NORMALIZE_IMAGE)