Sudden Errors on all jobs after CS2 working fine for several jobs


After using CSv.2 for several jobs (particle import, 2D classification and 2D class selection) cryosparc stopped working for all jobs, even if I clone a previously successful job and try to re-run it. The error I get upon trying to relaunch a 2D classification job is :

Traceback (most recent call last):
File “cryosparc2_worker/cryosparc2_compute/”, line 78, in
File “cryosparc2_worker/cryosparc2_compute/jobs/class2D/”, line 53, in
File “cryosparc2_compute/”, line 30, in init
self.from_dataset(d) # copies in all data
File “cryosparc2_compute/”, line 321, in from_dataset =
AttributeError: ‘NoneType’ object has no attribute ‘data’

Any idea how to troubleshoot? Thanks in advance,