Hi Prasad,
I've seen the error that you talked about with the ungenerated once or twice and running the calibration procedure again properly generated the files.
This is a sample stereo cal from my board (that has a few additional data fields from a soon to be released cal rework) that would serve as a good general idea of what the files should look like. The DFS algorithm is, however, very sensitive to inaccuracies and I'd strongly recommend trying to calibrate your cameras again, but if that doesn't work you can add your values to this format:
yocto:/$ cat /data/modalai/opencv_stereo_extrinsics.yml
%YAML:1.0
---
R: !!opencv-matrix
rows: 3
cols: 3
dt: d
data: [ 9.9965050025202740e-01, -5.6519379540328910e-04,
2.6430245966411248e-02, 2.8842568739021546e-03,
9.9613506820545850e-01, -8.7787282413751958e-02,
-2.6278478041102546e-02, 8.7832832399280705e-02,
9.9578854941426354e-01 ]
T: !!opencv-matrix
rows: 3
cols: 1
dt: d
data: [ -7.9514399346537298e-02, -2.7245018421472277e-03,
6.0288890076187220e-04 ]
reprojection_error: 2.8997817600221831e-01
calibration_time: "2021-09-30 22:52:56"
yocto:/$ cat /data/modalai/opencv_stereo_intrinsics.yml
%YAML:1.0
---
M1: !!opencv-matrix
rows: 3
cols: 3
dt: d
data: [ 4.9291881707143079e+02, 0., 3.0643471662712096e+02, 0.,
4.9232152259255315e+02, 2.1697996372929907e+02, 0., 0., 1. ]
D1: !!opencv-matrix
rows: 5
cols: 1
dt: d
data: [ -1.6984598364049669e-01, 6.0034285910162230e-02,
-8.8644933037586781e-04, -4.1419313003228072e-04, 0. ]
reprojection_error1: 1.9741562557305206e-01
M2: !!opencv-matrix
rows: 3
cols: 3
dt: d
data: [ 4.9673975454370270e+02, 0., 3.1711708934220133e+02, 0.,
4.9610254255552854e+02, 2.2876245199481119e+02, 0., 0., 1. ]
D2: !!opencv-matrix
rows: 5
cols: 1
dt: d
data: [ -1.6758727319959599e-01, 5.4041564358266361e-02,
-1.5695644102222835e-03, -5.8891426327232642e-04, 0. ]
reprojection_error2: 3.1594418176162986e-01
width: 640
height: 480
distortion_model: plumb_bob
calibration_time: "2021-09-30 22:52:56"
