The following error, or similar, appears after changing the policy name on the router:
Unexpected Website Error
Can't find parent class for policy: 'voip-sub-backbone-B' with PMID: 88 and ParentCMObjectIndex: 7082977
This occurs when the NTA database was not updated when the policy name was changed.
Upgrade to later version of NTA. this issue is fixed in NTA 4.x and higher.
If you are unable to upgrade, download and apply NTA 3.11 Hot Fix 4 from the SolarWinds Customer Portal.