Unable to rollback prometheus from 15.3.0 to 13.6.0


Our current grafana version is 6.7.2 and we upgraded our prometheus from 13.6.0 to 15.3.0 later after upgrading the prometheus we are unable to list all the namespaces in grafana UI only we can see prometheus namespace only so we tried to roll back the prometheus chart to 13.6.0 but we encountered the below error Can anyone help me to resolve the issue
MicrosoftTeams-image (2)

What error? How did you upgrade and how did you try to roll back and in What OS?

MicrosoftTeams-image (2)
I got the above error and I upgraded using helm command
(helm upgrade -i release_name path_of_chart -f values.yaml -n namespace)
and roll back (helm rollback release name revision_number)

Is it my eyes or is that just not readable

Rollback prometheus failed: can’t patch “prometheus-server” with kind PersistentVolumeClaim:PersistentVolumeClaim “prometheus-server” is invalid.specs.resources.requests.storage: Forbidden field can’t be less than previous value && can’t patch “prometheus-kube-state-metrics” with kind Deployment.Deployment.apps “prometheus-kube-state-metrics” is invalid: spec.selector: Invalid value: v1.LabelSelector(MatchLabels:map[string]string{“apps.kubernetes.io/name":"kube-state-metrics”},Match Expressions:v1.LabelSelectorRequirement(nil)}: field is immutable