When navigating to NPSP Settings in a Sandbox, receive error Upsert failed. First exception on row 0; first error: DUPLICATE_VALUE, duplicate value found: SetupOwnerId duplicates value on record with id: <00D>[ORG ID]: []

When navigating to NPSP Settings, the user encounters the following error:

Upsert failed. First exception on row 0; first error: DUPLICATE_VALUE, duplicate value found: SetupOwnerId duplicates value on record with id: <00D>[ORG ID]: []
Error is in expression '{!onNpspSettingsLoad}' in component <apex:page> in page npsp:stg_settingsmanager:
Class.npsp.UTIL_CustomSettingsFacade.getOrgErrorSettings: line 435, column 1
Class.npsp.STG_InstallScript.getExistingNpspTriggerConfig: line 206, column 1
Class.npsp.STG_InstallScript.runNewOrgScript: line 165, column 1
Class.npsp.STG_SettingsManager_CTRL.onNpspSettingsLoad: line 81, column 1

Why This Occurs

This error typically occurs because the components of NPSP were not fully created within the Sandbox environment, and one or more dependencies may be missing.