Unable to process data : issue with opensfm reconstruction

Hi all,
We are trying to process 15 images that have 80% forward overlap. All the images had GPS exif. We used the docker to test odm on our images. The process run smoothly till we encountered this issue (see log below)

2019-09-26 16:25:09,776 DEBUG: Robust matching time : 0.000370025634766s
2019-09-26 16:25:09,776 DEBUG: Full matching 1535 / 1561, time: 1.84735012054s
[INFO] running /code/SuperBuild/src/opensfm/bin/opensfm create_tracks “/code/opensfm”
2019-09-26 16:25:10,547 INFO: reading features
2019-09-26 16:25:10,793 DEBUG: Merging features onto tracks
2019-09-26 16:25:11,752 DEBUG: Good tracks: 20409
[INFO] running /code/SuperBuild/src/opensfm/bin/opensfm reconstruct “/code/opensfm”
2019-09-26 16:25:14,246 INFO: Starting incremental reconstruction
2019-09-26 16:25:18,022 INFO: 0 partial reconstructions in total.
Traceback (most recent call last):
File “/code/run.py”, line 56, in
File “/code/stages/odm_app.py”, line 92, in execute
File “/code/opendm/types.py”, line 373, in run
File “/code/opendm/types.py”, line 373, in run
File “/code/opendm/types.py”, line 373, in run
File “/code/opendm/types.py”, line 354, in run
self.process(self.args, outputs)
File “/code/stages/run_opensfm.py”, line 48, in process
octx.update_config({‘undistorted_image_max_size’: gsd.image_max_size(photos, args.orthophoto_resolution, tree.opensfm_reconstruction, ignore_gsd=args.ignore_gsd)})
File “/code/opendm/gsd.py”, line 39, in image_max_size
isf = image_scale_factor(target_resolution, reconstruction_json, gsd_error_estimate)
File “/code/opendm/gsd.py”, line 55, in image_scale_factor
gsd = opensfm_reconstruction_average_gsd(reconstruction_json)
File “/usr/local/lib/python2.7/dist-packages/repoze/lru/init.py”, line 348, in cached_wrapper
val = func(*args, **kwargs)
File “/code/opendm/gsd.py”, line 105, in opensfm_reconstruction_average_gsd
reconstruction = data[0]
IndexError: list index out of range

we checked the reconstruction.json file under opensfm and it was empty.
Do you have any idea what went wrong?

Best Regards,