Error: Blackbaud.AppFx.Server.ServiceException: This feature requires one or more optional components that have not been installed

After installing or updating Blackbaud NetCommunity, the following error appears on the testconfig under NetCommunity - Default Content Loaded:

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> Blackbaud.AppFx.Server.ServiceException: This feature requires one or more optional components that have not been installed.
  at Blackbaud.AppFx.Server.SecurityCheckResult.ThrowSecurityFailError(RequestContext ctx, ServiceRequest req)
  at Blackbaud.AppFx.Server.Common.ValidateSecurityResult(SecurityCheckResult checkRes, RequestContext ctx, ServiceRequest req)
  at Blackbaud.AppFx.Server.AppService.BeginDispatchRequest(AsyncRequestProcessorBase processor, AsyncCallback callback, Object asyncState)
  at Blackbaud.AppFx.Server.AppFxWebService.BeginDataListLoad(DataListLoadRequest req, AsyncCallback callback, Object asyncState)

This message also appears when users try to login to the site, thus preventing them from doing any administrative work.
To resolve this issue, add the Application User: NT AUTHORITY\SYSTEM and stamp the database.

Environment

 Blackbaud NetCommunity

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