Can you please try view the configuration to trigger the error and then upload the latest logs?
I don't find any exception in the oms log uploaded.
by the way please also upload the vsphere client log.
if you are using Windows version vsphere it will be in the follow directory by default
C:\ProgramData\VMware\vCenterServer\logs\vsphere-client\logs\vsphere_client_virgo.log
if you use Linux version of vsphere then it will be usually in the follow directory
/var/log/vmware/vsphere-client/logs