message: frontend: loadError prop can be either a string or an error object
diff: @@ -106,7 +106,7 @@ List.propTypes = {
  fieldSelector: React.PropTypes.string,
  filters: React.PropTypes.object,
  loaded: React.PropTypes.bool,
  - loadError: React.PropTypes.string,
  + loadError: React.PropTypes.oneOfType([React.PropTypes.object, React.PropTypes.string]),
  namespace: React.PropTypes.string,
  reduxID: React.PropTypes.string,
  selector: React.PropTypes.object,
  