// Err will return the error from the operation that created this SingleResult.
// If there was no error, nil is returned.
Err will return the error from the operation that created this SingleResult.
If there was no error, nil is returned.
// Err will return the error from the operation that created this SingleResult . // If there was no error nil is returned .
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 will return the error from the operation that created this SingleResult.
Err will return the error from the operation that created this SingleResult .