func (sr *SingleResult) Err() error {
	sr.err = sr.setRdrContents()

	return sr.err
}
// Err returns the error from the operation that created this SingleResult. If the operation was successful but did not
// return any documents, Err will return ErrNoDocuments. If the operation was successful and returned a document, Err
// will return nil.
Err returns the error from the operation that created this SingleResult. If the operation was successful but did not
return any documents, Err will return ErrNoDocuments. If the operation was successful and returned a document, Err
will return nil.
// Err returns the error from the operation that created this SingleResult . If the operation was successful but did not // return any documents Err will return ErrNoDocuments . If the operation was successful and returned a document Err // will return nil .
func (sr *SingleResult) Err() error {
	sr.err = sr.setRdrContents()
	return sr.err
}
func ( sr * SingleResult ) Err ( ) error { sr . err = sr . setRdrContents ( ) return sr . err }
Err returns the error from the operation that created this SingleResult.
Err returns the error from the operation that created this SingleResult .