Topaz cross validation

what is this error and how to trouble shoot it?
[CPU: 207.0 MB]
Traceback (most recent call last):
File “cryosparc_master/cryosparc_compute/run.py”, line 95, in cryosparc_compute.run.main
File “/admin/opt/common/cryosparc/patel/CS-4.3.1/cryosparc_worker/cryosparc_compute/jobs/topaz/run_topaz.py”, line 792, in run_topaz_wrapper_cross_validation
assert len(tables) > 0, “All subsidiary training jobs failed or were killed.”
AssertionError: All subsidiary training jobs failed or were killed.