errors:
  handleNotUnique: handle not unique
  invalidHandle: invalid handle
  invalidID: invalid ID
  invalidNamespaceID: invalid or missing namespace ID
  moduleNotFound: module does not exist
  namespaceNotFound: namespace does not exist
  notAllowedToCreate: not allowed to create pages
  notAllowedToDelete: not allowed to delete this page
  notAllowedToListPages: not allowed to list pages
  notAllowedToRead: not allowed to read this page
  notAllowedToReadNamespace: not allowed to read this namespace
  notAllowedToSearch: not allowed to search or list pages
  notAllowedToUndelete: not allowed to undelete this page
  notAllowedToUpdate: not allowed to update this page
  notFound: page does not exist
  staleData: page was modified by someone else or by a workflow after you've opened it. Please refresh to see the latest updated version