[slurm-users] Error when upgrading to 21.08.1

[Hoot Thompson]

In upgrading to 21.08.1, slurmctld status reports:

 

Sep 23 13:49:52 ip-10-10-7-17 systemd[1]: Started Slurm controller daemon.

Sep 23 13:49:52 ip-10-10-7-17 slurmctld[1323]: fatal: Unable to find plugin: 
serializer/json

Sep 23 13:49:52 ip-10-10-7-17 systemd[1]: slurmctld.service: Main process 
exited, code=exited, status=1/FAILURE

Suggestions on resolving this?

Thanks in advance!