If the "Default storage class" is not set then Kong PV and PVC creation may fail and that's specified in nonrtric/helm/kongstorage/kongvalues.yaml
Only Check the default StorageClass or ONLY for development proposes persistence can be disabled:
sed -i '/persistence:/,/existingClaim:/s/existingClaim: .*/enabled: false/' ./nonrtric/helm/kongstorage/kongvalues.yaml && rm -rf ./nonrtric/helm/kongstorage/templates

sudo ./dep/bin/undeploy-nonrtric.sh